Not a Moment to Waste $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". Not a Moment to Waste quantity Add to cart SKU: 10035. Category: Sports. Related Products Read Between the Pines $20.00 Yoga $20.00 Run Home $20.00 Across the Miles $20.00