Giving is in the Air $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". Giving is in the Air quantity Add to cart SKU: 10115. Categories: Christmas - Holiday, Hearts, Peace. Related Products Each of Us Makes a Ripple $20.00 We Grow Together $20.00 Wishing You a Bee-You-Tea-Full Day $20.00 Art is Therapy $20.00