A Big Addition $20.00 Inside Message Inside: And a Little Deduction 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". A Big Addition quantity Add to cart SKU: 17. Category: Baby - Parenting. Related Products Give Peas a Chance $20.00 The Plot Thickens $20.00 Speak Love, Sing Faith $20.00 You Have Learned to Make Friends $20.00