Friends are the Fiber $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". Friends are the Fiber quantity Add to cart SKU: 200. Category: Friendship & Support. Related Products A Friend is Like a Quilt $20.00 Wishing You a Bee-You-Tea-Full Day $20.00 Friends Keep you Growing $20.00 Memories, Blue Jeans, Bicycle Seats and You $20.00