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 Velo Dogs $20.00 You Are So Good to Me $20.00 Chews Gifts Carefully $20.00 Caw Caw Cawfee $20.00