Desperate Houseflies $20.00 Inside Message Inside: Seize the Moment 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". Desperate Houseflies quantity Add to cart SKU: 1178. Categories: Friendship & Support, Humor. Related Products The World is at Your Feet $20.00 Room With a View $20.00 Buy Now Pray Later $20.00 Close Knit Friends $20.00