All I Can Hear is My Heart $20.00 Inside Message Blank 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". All I Can Hear is My Heart quantity Add to cart SKU: 510. Categories: Hearts, Humor, Music. Related Products All I See Is You $20.00 In Deep $20.00 I Love You from the Bottom of My Heart $20.00 Thanks for Your Strength $20.00