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 Father, sun and holy bicycle $20.00 May You Always have Tailwinds $20.00 Room With a View $20.00 Never Look Back $20.00