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 Give Peas a Chance $20.00 Buy Now Pray Later $20.00 A Friend is Like a Quilt $20.00