How Sweet it Was $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". How Sweet it Was quantity Add to cart SKU: 537. Categories: Friendship & Support, Gardening. Related Products just add flour $20.00 If Fences Were Flowers $20.00 Blue Columbine $20.00 Once in a while, I dig in my heels $20.00