Share an Umbrella $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". Quantity Add to cart SKU: 92. Category: Friendship & Support. Related Products A Simple Thank You $20.00 The Past is Gone $20.00 Memories, Blue Jeans, Bicycle Seats and You $20.00 You Will Never Fly $20.00