Key ring, also known as key buckle, keyring, key chain, key hanging and so on. The material for making keychain is usually metal, leather, plastic, wood, etc. This exquisite and small, the shape of the ever-changing is people carry daily necessities. A keychain is a decorative item that hangs on a key ring. To choose the key with their favorite key chain, not only can reflect the individual mood and personality, but also to show their own taste and bring a happy mood. Key ring modelling, such as cartoon shape, brand modeling, simulation model, such as the material generally such as copper, aluminum, rubber, plastic, etc., is now mainly zinc alloy surface nickel or rhodium and other anti-rust elements. Keychain has now become a gift of small gifts.