Christmas Cat $20.00 Inside Message Blank Inside Packages of Heartstrings® cards are shrink-wrapped and sold in sets of 10 cards with envelopes. The actual card size is 4 1/4" x 5 1/2". Christmas Cat quantity Add to cart SKU: 77. Category: Christmas - Holiday. Related Products The Season to Remember Your Roots $20.00 Coal In One $20.00 Not a Creature was Stirring $20.00 Cold Hands, Warm Heart $20.00