Coal In One $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". Coal In One quantity Add to cart SKU: 693. Categories: Christmas - Holiday, Sports. Related Products Fat, Tired and Merry $20.00 Go to the Forest $20.00 Vitamin XC $20.00 Oh What Fun It Is to Ride $20.00