Primitive Key to My Heart Valentine Cast Iron Key Decoration. Brand new item and design for Valentine's Day. I found these unique large cast iron keys. I tied burlap and burgundy and tan checked fabric in a bow. Added a primitive tag that reads Key to My Heart. The key measures 6" x 2 3/4". Decorated by Heidi. Only 3 Available. Choice of key A, B or C, as each top of key is a little different.