Go to the Forest $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". Go to the Forest quantity Add to cart SKU: 624. Category: Christmas - Holiday. Related Products Chews Gifts Carefully $20.00 A Little Peace of Christmas $20.00 The Spirit Moves Me $20.00 High Hopes $20.00