Artist Trading Cards are miniature pieces of art that are traded around the world. Artists create, trade and collect art at organized swap events, either in person or online. The only official rule is that the trading card measures 2.5" x 3.5". This artist paper pack features downsized versions of the same Strathmore papers that artists use for their full-sized art, conveniently cut to the official trading size - making it easy for artists to join this large and growing movement.Details: 2.5" x 3.5" (6.35cm x 8.89cm) card size20 sheets100 lb. (270 gsm)Ideal for pen and ink drawingAcid-freeBristol paperVellum surface