A Simple Thank You $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". A Simple Thank You quantity Add to cart SKU: 32. Categories: Friendship & Support, Thank You. Related Products Friends Keep you Growing $20.00 With Every Great Loss $20.00 Close Knit Friends $20.00 Hi $20.00