Read Between the Pines $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". Read Between the Pines quantity Add to cart SKU: 552. Category: Sports. Related Products Baby with bike trailer $20.00 Father, sun and holy bicycle $20.00 Fat, Tired and Merry $20.00 Yoga $20.00