Memories, Blue Jeans, Bicycle Seats and You $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". Memories, Blue Jeans, Bicycle Seats and You quantity Add to cart SKU: 56. Category: Friendship & Support. Related Products Trust the Moon $20.00 Close Knit Friends $20.00 Buy Now Pray Later $20.00 Wishing You a Bee-You-Tea-Full Day $20.00