Fire Up the Choir $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". Fire Up the Choir quantity Add to cart SKU: 308. Categories: Birthday, Humor. Tags: art cards, art greeting cards, birthday cards, unique birthday cards, unique cards, unique greeting cards. Related Products Unidentified Frying Object $20.00 Working My Tail Off $20.00 Room With a View $20.00 You are the Rock in My River $20.00