Played by 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". Played by heart quantity Add to cart SKU: 869. Categories: Hearts, Music. Related Products All I See Is You $20.00 Chocolate for My Bud $20.00 Wishing You a Bee-You-Tea-Full Day $20.00 You are the Rock in My River $20.00