The unleashed heart $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". The unleashed heart quantity Add to cart SKU: 878. Category: Hearts. Related Products Heart at Work $20.00 You are the Rock in My River $20.00 The Beet Grows On $20.00 Squeeze the Day $20.00