Keychain, also known as keychain, key ring, key chain, key hang, 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 every day. The keychain is a decorative item that hangs on the key ring. Choosing the key with your favorite keychain not only reflects your personal mood and personality, but also shows your taste and brings you a happy mood. The keychain has many shapes, such as cartoon shape, brand shape, simulation model, etc. The materials are generally made of copper, aluminum, rubber, plastic, etc. Now, the zinc alloy is mainly coated with nickel or antimony. The keychain has now become a gift for small gifts. Alloys: Most of them are made of zinc alloy electroplated nickel, electroplated gold, and generally do not fade in normal use. Gold should be kept away from the acid and alkali environment during use, otherwise it will easily cause fading. Cortic: Avoid sharp objects, such as cortex protection oil can be properly applied.