About 27x26mm, you get the set of the heart with the key. This item is still made in a variety of sizes, this is the medium sized one and very practical for using to put on charm bracelets and necklaces, and it also makes cool earrings if you want to go that way! Brass base plated in a rusty black patina, sold with set of heart and key.
NOTE: you have to distress the brass to make them look right, reveal the copper undercoat by buffing out with steel wool. You just gotta try it....the look is fabulous!