Hi $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". Hi quantity Add to cart SKU: 113. Categories: Friendship & Support, Pets. Related Products You Will Never Fly $20.00 Buy Now Pray Later $20.00 The Past is Gone $20.00 The World is at Your Feet $20.00