Fly With Me $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". Fly With Me quantity Add to cart SKU: 1084. Category: Friendship & Support. Related Products High Hopes $20.00 A Simple Thank You $20.00 Friends Keep you Growing $20.00 Everything is Within Reach $20.00