My Heart $20.00 Inside Message Inside Message: is tied to yours 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". My Heart quantity Add to cart SKU: my-heart. Category: Hearts. Related Products Heart at Work $20.00 In Deep $20.00 Art is Therapy $20.00 With Every Move $20.00