Soft serve $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". Soft serve quantity Add to cart SKU: 972. Category: Sports. Related Products Coal In One $20.00 Fat, Tired and Merry $20.00 It’s More than the shoes $20.00 May You Always have Tailwinds $20.00