Also known as key chain, key ring, key chain, key hanging, etc. The material for making the keychain is generally metal, leather, plastic, wood, and the like. This object is exquisite and compact, and its shape is ever-changing. It is a daily necessities that people carry with them. The keychain is a decorative item that hangs on the key ring. There are many types of keychains, such as cartoon shape, brand shape, simulation model, etc. The materials are generally copper, aluminum, rubber, plastic, etc., mainly nickel-plated or anti-rust elements on the surface of zinc alloy. The keychain has become a gift.