copper, bronze, brass, keyring, chain Each circle measures approximately 4cm Each is 100% handmade from start to finish in our small home shop. They are all made by cutting the metal into the shape of a circle. Each is then further shaped and fine tuned to eliminate rough edges. They are personalized with hand stamping. Each letter is carefully hammered into the metal - one by one. The spacing and depth of the letters can vary - since this is not done by a machine. These differences make every item completely one of a kind.