This Is It $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". This Is It quantity Add to cart SKU: 227. Categories: Birthday, Food. Related Products Queen for a day $20.00 When You’re Over the Hill $20.00 King For A Day $20.00 Chews Gifts Carefully $20.00