Close Knit Friends $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". Close Knit Friends quantity Add to cart SKU: 80. Categories: Friendship & Support, Women. Related Products You Will Never Fly $20.00 Hi $20.00 Wishing You a Bee-You-Tea-Full Day $20.00 Buy Now Pray Later $20.00