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 Light a Candle $20.00 I heard by word of mouse $20.00 Mountains of Wishes $20.00 This Too Shall Pass $20.00