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 May the Bumps of Life $20.00 Father, sun and holy bicycle $20.00 Room With a View $20.00 Each of Us Makes a Ripple $20.00