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 Everything’s Gonna Be All White $20.00 One if by Land $20.00 May Peace Surround You $20.00 Claustrophobia $20.00