100 BLANK CREAM ACEO ATC ARTIST TRADING CARDS ~ DRAWING CARDSTOCK 80# SMOOTH Cream Cardstock. These are a medium weight cardstock like business cards. THESE ARE NOT WATERCOLOR PAPER. If you are planning to use a lot of water, you may want to find watercolor ACEO cards instead. ACEO ATC Artist Trading Cards 100% Acid Free and 100% Recycled Cardstock. Environmentally friendly. Size: 2-1/2"x 3-1/2" Use Horizontal or Vertical