Hi $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". Hi quantity Add to cart SKU: 113. Categories: Friendship & Support, Pets. Related Products Friends are the Fiber $20.00 With Every Great Loss $20.00 Memories, Blue Jeans, Bicycle Seats and You $20.00 Room With a View $20.00