Merry middle c $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". Merry middle c quantity Add to cart SKU: 991. Categories: Christmas - Holiday, Music. Related Products Cranberries are Like Family $20.00 Not a Creature was Stirring $20.00 Christmas Cat $20.00 The Spirit Moves Me $20.00