Nielsen Classic Aluminium Frames

Nielsen Classic Aluminium Frames

Nielsen Classic Aluminium Frames have a pleasing, slightly rounded profile. They are made from high quality aluminium and have a simple elegance. More
incl. VAT | Delivery Information.
Nielsen Classic Aluminium Frames, Gold, 10 cm x 15 cm
 
Gold
Format
10 cm x 15 cm
Code 76182001
Ready for shipping
 
£ 16.29
Nielsen Classic Aluminium Frames, Silver, 10 cm x 15 cm
 
Silver
Format
10 cm x 15 cm
Code 76182003
Ready for shipping
 
£ 16.29
Nielsen Classic Aluminium Frames, Matt Silver, 10 cm x 15 cm
 
Matt Silver
Format
10 cm x 15 cm
Code 76182004
Ready for shipping
 
£ 16.29
Nielsen Classic Aluminium Frames, Contrast Grey, 10 cm x 15 cm
 
Contrast Grey
Format
10 cm x 15 cm
Code 76182006
Ready for shipping
 
£ 16.29
Nielsen Classic Aluminium Frames, Platinum, 10 cm x 15 cm
 
Platinum
Format
10 cm x 15 cm
Code 76182019
Ready for shipping
 
£ 16.29
Nielsen Classic Aluminium Frames, Matt Black, 10 cm x 15 cm
 
Matt Black
Format
10 cm x 15 cm
Code 76182021
Ready for shipping
 
£ 16.29
Nielsen Classic Aluminium Frames, Gold, 15 cm x 20 cm
 
Gold
Format
15 cm x 20 cm
Code 76184001
Ready for shipping
 
£ 21.09
Nielsen Classic Aluminium Frames, Silver, 15 cm x 20 cm
 
Silver
Format
15 cm x 20 cm
Code 76184003
Ready for shipping
 
£ 21.09
Nielsen Classic Aluminium Frames, Matt Silver, 15 cm x 20 cm
 
Matt Silver
Format
15 cm x 20 cm
Code 76184004
Ready for shipping
 
£ 21.09
Nielsen Classic Aluminium Frames, Contrast Grey, 15 cm x 20 cm
 
Contrast Grey
Format
15 cm x 20 cm
Code 76184006
Ready for shipping
 
£ 21.09
Nielsen Classic Aluminium Frames, Platinum, 15 cm x 20 cm
 
Platinum
Format
15 cm x 20 cm
Code 76184019
Ready for shipping
 
£ 21.09
Nielsen Classic Aluminium Frames, Matt Black, 15 cm x 20 cm
 
Matt Black
Format
15 cm x 20 cm
Code 76184021
Ready for shipping
 
£ 21.09
Nielsen Classic Aluminium Frames, Brilliant Gold, A4 - 21 cm x 29.7 cm
 
Brilliant Gold
Format
A4 - 21 cm x 29.7 cm
Code 76170001
Ready for shipping
 
£ 28.99
Nielsen Classic Aluminium Frames, Matt Gold, A4 - 21 cm x 29.7 cm
 
Matt Gold
Format
A4 - 21 cm x 29.7 cm
Code 76170002
Ready for shipping
 
£ 28.99
Nielsen Classic Aluminium Frames, Brilliant Silver, A4 - 21 cm x 29.7 cm
 
Brilliant Silver
Format
A4 - 21 cm x 29.7 cm
Code 76170003
Ready for shipping
 
£ 28.99
Nielsen Classic Aluminium Frames, Matt Silver, A4 - 21 cm x 29.7 cm
 
Matt Silver
Format
A4 - 21 cm x 29.7 cm
Code 76170004
Ready for shipping
 
£ 28.99
Nielsen Classic Aluminium Frames, Grey, A4 - 21 cm x 29.7 cm
 
Grey
Format
A4 - 21 cm x 29.7 cm
Code 76170006
Ready for shipping
 
£ 28.99
Nielsen Classic Aluminium Frames, Champagne, A4 - 21 cm x 29.7 cm
 
Champagne
Format
A4 - 21 cm x 29.7 cm
Code 76170011
Ready for shipping
 
£ 28.99
Nielsen Classic Aluminium Frames, Anodised Black, A4 - 21 cm x 29.7 cm
 
Anodised Black
Format
A4 - 21 cm x 29.7 cm
Code 76170016
Ready for shipping
 
£ 28.99
Nielsen Classic Aluminium Frames, Platinum, A4 - 21 cm x 29.7 cm
 
Platinum
Format
A4 - 21 cm x 29.7 cm
Code 76170019
Ready for shipping
 
£ 28.99
Nielsen Classic Aluminium Frames, Matt Black, A4 - 21 cm x 29.7 cm
 
Matt Black
Format
A4 - 21 cm x 29.7 cm
Code 76170021
Ready for shipping
 
£ 28.99
Nielsen Classic Aluminium Frames, Blue, A4 - 21 cm x 29.7 cm
 
Blue
Format
A4 - 21 cm x 29.7 cm
Code 76170041
Ready for shipping
 
£ 28.99
Nielsen Classic Aluminium Frames, Brilliant White, A4 - 21 cm x 29.7 cm
 
Brilliant White
Format
A4 - 21 cm x 29.7 cm
Code 76170056
Ready for shipping
 
£ 28.99
Nielsen Classic Aluminium Frames, Structured Walnut, A4 - 21 cm x 29.7 cm
 
Structured Walnut
Format
A4 - 21 cm x 29.7 cm
Code 76170060
Ready for shipping
 
£ 28.99
Nielsen Classic Aluminium Frames, Brilliant Gold, 20 cm x 30 cm
 
Brilliant Gold
Format
20 cm x 30 cm
Code 76161001
Ready for shipping
 
£ 31.09
Nielsen Classic Aluminium Frames, Matt Gold, 20 cm x 30 cm
 
Matt Gold
Format
20 cm x 30 cm
Code 76161002
Ready for shipping
 
£ 28.29
Nielsen Classic Aluminium Frames, Brilliant Silver, 20 cm x 30 cm
 
Brilliant Silver
Format
20 cm x 30 cm
Code 76161003
Ready for shipping
 
£ 31.09
Nielsen Classic Aluminium Frames, Matt Silver, 20 cm x 30 cm
 
Matt Silver
Format
20 cm x 30 cm
Code 76161004
Ready for shipping
 
£ 31.09
Nielsen Classic Aluminium Frames, Contrast Grey, 20 cm x 30 cm
 
Contrast Grey
Format
20 cm x 30 cm
Code 76161006
Ready for shipping
 
£ 31.09
Nielsen Classic Aluminium Frames, Champagne, 20 cm x 30 cm
 
Champagne
Format
20 cm x 30 cm
Code 76161011
Ready for shipping
 
£ 31.09
Nielsen Classic Aluminium Frames, Anodised Black, 20 cm x 30 cm
 
Anodised Black
Format
20 cm x 30 cm
Code 76161016
Ready for shipping
 
£ 31.09
Nielsen Classic Aluminium Frames, Platinum, 20 cm x 30 cm
 
Platinum
Format
20 cm x 30 cm
Code 76161019
Ready for shipping
 
£ 31.09
Nielsen Classic Aluminium Frames, Matt Black, 20 cm x 30 cm
 
Matt Black
Format
20 cm x 30 cm
Code 76161021
Ready for shipping
 
£ 31.09
Nielsen Classic Aluminium Frames, Brilliant White, 20 cm x 30 cm
 
Brilliant White
Format
20 cm x 30 cm
Code 76161056
Ready for shipping
 
£ 31.09
Nielsen Classic Aluminium Frames, Structured Walnut, 20 cm x 30 cm
 
Structured Walnut
Format
20 cm x 30 cm
Code 76161060
Ready for shipping
 
£ 31.09
Nielsen Classic Aluminium Frames, Brilliant Gold, 24 cm x 30 cm
 
Brilliant Gold
Format
24 cm x 30 cm
Code 76171001
Ready for shipping
 
£ 32.99
Nielsen Classic Aluminium Frames, Matt Gold, 24 cm x 30 cm
 
Matt Gold
Format
24 cm x 30 cm
Code 76171002
Ready for shipping
 
£ 32.99
Nielsen Classic Aluminium Frames, Brilliant Silver, 24 cm x 30 cm
 
Brilliant Silver
Format
24 cm x 30 cm
Code 76171003
Ready for shipping
 
£ 32.99
Nielsen Classic Aluminium Frames, Matt Silver, 24 cm x 30 cm
 
Matt Silver
Format
24 cm x 30 cm
Code 76171004
Ready for shipping
 
£ 32.99
Nielsen Classic Aluminium Frames, Grey, 24 cm x 30 cm
 
Grey
Format
24 cm x 30 cm
Code 76171006
Ready for shipping
 
£ 32.99
Nielsen Classic Aluminium Frames, Champagne, 24 cm x 30 cm
 
Champagne
Format
24 cm x 30 cm
Code 76171011
Ready for shipping
 
£ 32.99
Nielsen Classic Aluminium Frames, Anodised Black, 24 cm x 30 cm
 
Anodised Black
Format
24 cm x 30 cm
Code 76171016
Ready for shipping
 
£ 32.99
Nielsen Classic Aluminium Frames, Platinum, 24 cm x 30 cm
 
Platinum
Format
24 cm x 30 cm
Code 76171019
Ready for shipping
 
£ 32.99
Nielsen Classic Aluminium Frames, Matt Black, 24 cm x 30 cm
 
Matt Black
Format
24 cm x 30 cm
Code 76171021
Ready for shipping
 
£ 32.99
Nielsen Classic Aluminium Frames, Blue, 24 cm x 30 cm
 
Blue
Format
24 cm x 30 cm
Code 76171041
Ready for shipping
 
£ 32.99
Nielsen Classic Aluminium Frames, Brilliant White, 24 cm x 30 cm
 
Brilliant White
Format
24 cm x 30 cm
Code 76171056
Ready for shipping
 
£ 32.99
Nielsen Classic Aluminium Frames, Structured Walnut, 24 cm x 30 cm
 
Structured Walnut
Format
24 cm x 30 cm
Code 76171060
Ready for shipping
 
£ 32.99
Nielsen Classic Aluminium Frames, Brilliant Gold, A3 - 29.7 cm x 42 cm
 
Brilliant Gold
Format
A3 - 29.7 cm x 42 cm
Code 76172001
Ready for shipping
 
£ 34.29
Nielsen Classic Aluminium Frames, Matt Gold, A3 - 29.7 cm x 42 cm
 
Matt Gold
Format
A3 - 29.7 cm x 42 cm
Code 76172002
Ready for shipping
 
£ 34.29
Nielsen Classic Aluminium Frames, Brilliant Silver, A3 - 29.7 cm x 42 cm
 
Brilliant Silver
Format
A3 - 29.7 cm x 42 cm
Code 76172003
Ready for shipping
 
£ 34.29
Nielsen Classic Aluminium Frames, Matt Silver, A3 - 29.7 cm x 42 cm
 
Matt Silver
Format
A3 - 29.7 cm x 42 cm
Code 76172004
Ready for shipping
 
£ 34.29
Nielsen Classic Aluminium Frames, Grey, A3 - 29.7 cm x 42 cm
 
Grey
Format
A3 - 29.7 cm x 42 cm
Code 76172006
Ready for shipping
 
£ 34.29
Nielsen Classic Aluminium Frames, Champagne, A3 - 29.7 cm x 42 cm
 
Champagne
Format
A3 - 29.7 cm x 42 cm
Code 76172011
Ready for shipping
 
£ 34.29
Nielsen Classic Aluminium Frames, Anodised Black, A3 - 29.7 cm x 42 cm
 
Anodised Black
Format
A3 - 29.7 cm x 42 cm
Code 76172016
Ready for shipping
 
£ 34.29
Nielsen Classic Aluminium Frames, Platinum, A3 - 29.7 cm x 42 cm
 
Platinum
Format
A3 - 29.7 cm x 42 cm
Code 76172019
Ready for shipping
 
£ 34.29
Nielsen Classic Aluminium Frames, Matt Black, A3 - 29.7 cm x 42 cm
 
Matt Black
Format
A3 - 29.7 cm x 42 cm
Code 76172021
Ready for shipping
 
£ 34.29
Nielsen Classic Aluminium Frames, Blue, A3 - 29.7 cm x 42 cm
 
Blue
Format
A3 - 29.7 cm x 42 cm
Code 76172041
Ready for shipping
 
£ 34.29
Nielsen Classic Aluminium Frames, Brilliant White, A3 - 29.7 cm x 42 cm
 
Brilliant White
Format
A3 - 29.7 cm x 42 cm
Code 76172056
Ready for shipping
 
£ 34.29
Nielsen Classic Aluminium Frames, Structured Walnut, A3 - 29.7 cm x 42 cm
 
Structured Walnut
Format
A3 - 29.7 cm x 42 cm
Code 76172060
Ready for shipping
 
£ 34.29
Nielsen Classic Aluminium Frames, Brilliant Gold, 30 cm x 40 cm
 
Brilliant Gold
Format
30 cm x 40 cm
Code 76173001
Ready for shipping
 
£ 38.19
Nielsen Classic Aluminium Frames, Matt Gold, 30 cm x 40 cm
 
Matt Gold
Format
30 cm x 40 cm
Code 76173002
Ready for shipping
 
£ 38.19
Nielsen Classic Aluminium Frames, Brilliant Silver, 30 cm x 40 cm
 
Brilliant Silver
Format
30 cm x 40 cm
Code 76173003
Ready for shipping
 
£ 38.19
Nielsen Classic Aluminium Frames, Matt Silver, 30 cm x 40 cm
 
Matt Silver
Format
30 cm x 40 cm
Code 76173004
Ready for shipping
 
£ 38.19
Nielsen Classic Aluminium Frames, Grey, 30 cm x 40 cm
 
Grey
Format
30 cm x 40 cm
Code 76173006
Ready for shipping
 
£ 38.19
Nielsen Classic Aluminium Frames, Champagne, 30 cm x 40 cm
 
Champagne
Format
30 cm x 40 cm
Code 76173011
Ready for shipping
 
£ 38.19
Nielsen Classic Aluminium Frames, Anodised Black, 30 cm x 40 cm
 
Anodised Black
Format
30 cm x 40 cm
Code 76173016
Ready for shipping
 
£ 38.19
Nielsen Classic Aluminium Frames, Platinum, 30 cm x 40 cm
 
Platinum
Format
30 cm x 40 cm
Code 76173019
Not in stock.
 
£ 38.19
Set a stock alert
Nielsen Classic Aluminium Frames, Matt Black, 30 cm x 40 cm
 
Matt Black
Format
30 cm x 40 cm
Code 76173021
Ready for shipping
 
£ 38.19
Nielsen Classic Aluminium Frames, Blue, 30 cm x 40 cm
 
Blue
Format
30 cm x 40 cm
Code 76173041
Ready for shipping
 
£ 38.19
Nielsen Classic Aluminium Frames, Brilliant White, 30 cm x 40 cm
 
Brilliant White
Format
30 cm x 40 cm
Code 76173056
Ready for shipping
 
£ 38.19
Nielsen Classic Aluminium Frames, Structured Walnut, 30 cm x 40 cm
 
Structured Walnut
Format
30 cm x 40 cm
Code 76173060
Ready for shipping
 
£ 38.19
Nielsen Classic Aluminium Frames, Brilliant Gold, 40 cm x 40 cm
 
Brilliant Gold
Format
40 cm x 40 cm
Code 76162001
Ready for shipping
 
£ 46.19
Nielsen Classic Aluminium Frames, Matt Gold, 40 cm x 40 cm
 
Matt Gold
Format
40 cm x 40 cm
Code 76162002
Ready for shipping
 
£ 46.19
Nielsen Classic Aluminium Frames, Brilliant Silver, 40 cm x 40 cm
 
Brilliant Silver
Format
40 cm x 40 cm
Code 76162003
Ready for shipping
 
£ 46.19
Nielsen Classic Aluminium Frames, Matt Silver, 40 cm x 40 cm
 
Matt Silver
Format
40 cm x 40 cm
Code 76162004
Ready for shipping
 
£ 46.19
Nielsen Classic Aluminium Frames, Contrast Grey, 40 cm x 40 cm
 
Contrast Grey
Format
40 cm x 40 cm
Code 76162006
Ready for shipping
 
£ 46.19
Nielsen Classic Aluminium Frames, Champagne, 40 cm x 40 cm
 
Champagne
Format
40 cm x 40 cm
Code 76162011
Ready for shipping
 
£ 46.19
Nielsen Classic Aluminium Frames, Anodised Black, 40 cm x 40 cm
 
Anodised Black
Format
40 cm x 40 cm
Code 76162016
Ready for shipping
 
£ 46.19
Nielsen Classic Aluminium Frames, Platinum, 40 cm x 40 cm
 
Platinum
Format
40 cm x 40 cm
Code 76162019
Ready for shipping
 
£ 46.19
Nielsen Classic Aluminium Frames, Matt Black, 40 cm x 40 cm
 
Matt Black
Format
40 cm x 40 cm
Code 76162021
Ready for shipping
 
£ 46.19
Nielsen Classic Aluminium Frames, Blue, 40 cm x 40 cm
 
Blue
Format
40 cm x 40 cm
Code 76162041
Ready for shipping
 
£ 46.19
Nielsen Classic Aluminium Frames, Brilliant White, 40 cm x 40 cm
 
Brilliant White
Format
40 cm x 40 cm
Code 76162056
Not in stock.
 
£ 46.19
Set a stock alert
Nielsen Classic Aluminium Frames, Structured Walnut, 40 cm x 40 cm
 
Structured Walnut
Format
40 cm x 40 cm
Code 76162060
Ready for shipping
 
£ 46.19
Nielsen Classic Aluminium Frames, Brilliant Gold, 40 cm x 50 cm
 
Brilliant Gold
Format
40 cm x 50 cm
Code 76174001
Not in stock.
 
£ 52.79
Set a stock alert
Nielsen Classic Aluminium Frames, Matt Gold, 40 cm x 50 cm
 
Matt Gold
Format
40 cm x 50 cm
Code 76174002
Ready for shipping
 
£ 52.79
Nielsen Classic Aluminium Frames, Brilliant Silver, 40 cm x 50 cm
 
Brilliant Silver
Format
40 cm x 50 cm
Code 76174003
Ready for shipping
 
£ 52.79
Nielsen Classic Aluminium Frames, Matt Silver, 40 cm x 50 cm
 
Matt Silver
Format
40 cm x 50 cm
Code 76174004
Ready for shipping
 
£ 52.79
Nielsen Classic Aluminium Frames, Grey, 40 cm x 50 cm
 
Grey
Format
40 cm x 50 cm
Code 76174006
Ready for shipping
 
£ 52.79
Nielsen Classic Aluminium Frames, Champagne, 40 cm x 50 cm
 
Champagne
Format
40 cm x 50 cm
Code 76174011
Ready for shipping
 
£ 52.79
Nielsen Classic Aluminium Frames, Anodised Black, 40 cm x 50 cm
 
Anodised Black
Format
40 cm x 50 cm
Code 76174016
Ready for shipping
 
£ 52.79
Nielsen Classic Aluminium Frames, Platinum, 40 cm x 50 cm
 
Platinum
Format
40 cm x 50 cm
Code 76174019
Ready for shipping
 
£ 52.79
Nielsen Classic Aluminium Frames, Matt Black, 40 cm x 50 cm
 
Matt Black
Format
40 cm x 50 cm
Code 76174021
Ready for shipping
 
£ 52.79
Nielsen Classic Aluminium Frames, Blue, 40 cm x 50 cm
 
Blue
Format
40 cm x 50 cm
Code 76174041
Ready for shipping
 
£ 52.79
Nielsen Classic Aluminium Frames, Brilliant White, 40 cm x 50 cm
 
Brilliant White
Format
40 cm x 50 cm
Code 76174056
Ready for shipping
 
£ 52.79
Nielsen Classic Aluminium Frames, Structured Walnut, 40 cm x 50 cm
 
Structured Walnut
Format
40 cm x 50 cm
Code 76174060
Not in stock.
 
£ 52.79
Set a stock alert
Nielsen Classic Aluminium Frames, Brilliant Gold, A2 - 42 cm x 59.4 cm
 
Brilliant Gold
Format
A2 - 42 cm x 59.4 cm
Code 76175001
Ready for shipping
 
£ 64.59
Nielsen Classic Aluminium Frames, Matt Gold, A2 - 42 cm x 59.4 cm
 
Matt Gold
Format
A2 - 42 cm x 59.4 cm
Code 76175002
Not in stock.
 
£ 64.59
Set a stock alert
Nielsen Classic Aluminium Frames, Brilliant Silver, A2 - 42 cm x 59.4 cm
 
Brilliant Silver
Format
A2 - 42 cm x 59.4 cm
Code 76175003
Ready for shipping
 
£ 64.59
Nielsen Classic Aluminium Frames, Matt Silver, A2 - 42 cm x 59.4 cm
 
Matt Silver
Format
A2 - 42 cm x 59.4 cm
Code 76175004
Ready for shipping
 
£ 64.59
Nielsen Classic Aluminium Frames, Grey, A2 - 42 cm x 59.4 cm
 
Grey
Format
A2 - 42 cm x 59.4 cm
Code 76175006
Ready for shipping
 
£ 64.59
Nielsen Classic Aluminium Frames, Champagne, A2 - 42 cm x 59.4 cm
 
Champagne
Format
A2 - 42 cm x 59.4 cm
Code 76175011
Ready for shipping
 
£ 64.59
Nielsen Classic Aluminium Frames, Anodised Black, A2 - 42 cm x 59.4 cm
 
Anodised Black
Format
A2 - 42 cm x 59.4 cm
Code 76175016
Ready for shipping
 
£ 64.59
Nielsen Classic Aluminium Frames, Platinum, A2 - 42 cm x 59.4 cm
 
Platinum
Format
A2 - 42 cm x 59.4 cm
Code 76175019
Ready for shipping
 
£ 64.59
Nielsen Classic Aluminium Frames, Matt Black, A2 - 42 cm x 59.4 cm
 
Matt Black
Format
A2 - 42 cm x 59.4 cm
Code 76175021
Ready for shipping
 
£ 64.59
Nielsen Classic Aluminium Frames, Blue, A2 - 42 cm x 59.4 cm
 
Blue
Format
A2 - 42 cm x 59.4 cm
Code 76175041
Ready for shipping
 
£ 64.59
Nielsen Classic Aluminium Frames, Brilliant White, A2 - 42 cm x 59.4 cm
 
Brilliant White
Format
A2 - 42 cm x 59.4 cm
Code 76175056
Ready for shipping
 
£ 64.59
Nielsen Classic Aluminium Frames, Structured Walnut, A2 - 42 cm x 59.4 cm
 
Structured Walnut
Format
A2 - 42 cm x 59.4 cm
Code 76175060
Ready for shipping
 
£ 64.59
Nielsen Classic Aluminium Frames, Brilliant Gold, 40 cm x 60 cm
 
Brilliant Gold
Format
40 cm x 60 cm
Code 76181001
Ready for shipping
 
£ 65.99
Nielsen Classic Aluminium Frames, Brilliant Gold, 40 cm x 60 cm
 
Brilliant Gold
Format
40 cm x 60 cm
Code 76181002
Ready for shipping
 
£ 65.99
Nielsen Classic Aluminium Frames, Brillant Silver, 40 cm x 60 cm
 
Brillant Silver
Format
40 cm x 60 cm
Code 76181003
Ready for shipping
 
£ 65.99
Nielsen Classic Aluminium Frames, Matt Silver, 40 cm x 60 cm
 
Matt Silver
Format
40 cm x 60 cm
Code 76181004
Ready for shipping
 
£ 65.99
Nielsen Classic Aluminium Frames, Contrast Grey, 40 cm x 60 cm
 
Contrast Grey
Format
40 cm x 60 cm
Code 76181006
Ready for shipping
 
£ 65.99
Nielsen Classic Aluminium Frames, Champagne, 40 cm x 60 cm
 
Champagne
Format
40 cm x 60 cm
Code 76181011
Ready for shipping
 
£ 65.99
Nielsen Classic Aluminium Frames, Anodised Black, 40 cm x 60 cm
 
Anodised Black
Format
40 cm x 60 cm
Code 76181016
Ready for shipping
 
£ 65.99
Nielsen Classic Aluminium Frames, Platinum, 40 cm x 60 cm
 
Platinum
Format
40 cm x 60 cm
Code 76181019
Ready for shipping
 
£ 65.99
Nielsen Classic Aluminium Frames, Matt Black, 40 cm x 60 cm
 
Matt Black
Format
40 cm x 60 cm
Code 76181021
Ready for shipping
 
£ 65.99
Nielsen Classic Aluminium Frames, Blue, 40 cm x 60 cm
 
Blue
Format
40 cm x 60 cm
Code 76181041
Ready for shipping
 
£ 65.99
Nielsen Classic Aluminium Frames, Brilliant White, 40 cm x 60 cm