Sing every day $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". Sing every day quantity Add to cart SKU: 886. Category: Music. Related Products Sing the Unsung Song $20.00 All I Can Hear is My Heart $20.00 Played by heart $20.00 The Music Never Stops $20.00