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 The Beet Grows On $20.00 Each of Us Makes a Ripple $20.00 All I See Is You $20.00 Starve a Cold, Feed a Retreiver $20.00