You Will Never Fly $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". You Will Never Fly quantity Add to cart SKU: 245. Categories: Friendship & Support, Sympathy - Healing. Related Products Friendship is Continuous $20.00 High Hopes $20.00 Memories, Blue Jeans, Bicycle Seats and You $20.00 A Simple Thank You $20.00