for people who design things, then print them
85 × 55 mm
Which is about 2.2 × 3.3 inches
That’s it. That’s your answer.
If you want, you can 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.