What is card stock? Card stock is also known as cover paper. It is a form of stiff paper used for covers, postcards, brochures, business cards or even playing cards.Cardstock With the creation of the Stop Talking card, Set Editions was founded by Alison Riley in 2004. Set Editions offers letterpressed cards, foil stamped postcards, and other little stuff. Using recycled and post-consumer papers, ...card_stock