Caw Caw Cawfee $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". Quantity Add to cart SKU: 10103. Categories: Food, Friendship & Support, Humor, Pets. Related Products Friends Keep you Growing $20.00 A Friend is Like a Quilt $20.00 A Simple Thank You $20.00 Friendship is Continuous $20.00