Trust the Moon $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". Trust the Moon quantity Add to cart SKU: 233. Categories: Friendship & Support, Sympathy - Healing. Related Products High Hopes $20.00 A Friend is Like a Quilt $20.00 Hi $20.00 The Past is Gone $20.00