The card base is some new Hero Hues pattern paper that I won from Hero Arts (still excited about that!) and it's actually 8.5 x 11 cardstock. I expected thin paper but it's sturdy cardstock that is fabulous for a card base and it's white on the inside. I also have 3 new Hero Arts stamp sets that haven't seen ink yet. I really want to play with them but I've been too busy.