Your Sweaters and Letters $20.00 Inside Message Message Inside:Keep me warm 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". Your Sweaters and Letters quantity Add to cart SKU: 1143. Category: Friendship & Support. Related Products High Hopes $20.00 Wishing You a Bee-You-Tea-Full Day $20.00 Room With a View $20.00 Everything is Within Reach $20.00