for people who design things, then print them
99 × 210 mm
Which is ⅓ of an A4 sheet. It fits inside a DL envelope.
There’s your answer.
Find more paper sizes here.
A box of cards for choosing colours and making colour schemes.
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A box of 130 cards for playing with colour. For digital or print creatives. RGB and CMYK values. Millions of combinations.