Bone Appetit $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". Bone Appetit quantity Add to cart SKU: 897. Category: Pets. Related Products Always There When the Chips Are Down $20.00 Take it as it crumbs $20.00 A new leash on life $20.00 Hi $20.00