ATC's or Artists Trading Cards are for artists and craft people to create a miniature work of art. They can use any media or technique. The back is usually signed, dated and any contact details included. These are then traded, no money changes hands, for other ATC's to educate, inspire, advertise or to delight fellow artists/craft workers. Each card is 88mm x 63mm (3.5 x 2.5 inches)