Life is Sweet $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". Life is Sweet quantity Add to cart SKU: 176. Categories: Food, Humor. Related Products Room With a View $20.00 This Too Shall Pass $20.00 Light a Candle $20.00 Starve a Cold, Feed a Retreiver $20.00