Jump in feet first $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". Jump in feet first quantity Add to cart SKU: 939. Category: Sports. Related Products A chance to dance $20.00 When You’re Over the Hill $20.00 May You Always have Tailwinds $20.00 Fat, Tired and Merry $20.00