The keychain is a common trinkets that can make messy keychains come together for convenience. Hanging on the waistband will never leave the key. Keychains come in a variety of materials such as copper, aluminum, rubber, zinc alloys, acrylics, plastics, and more. When we often buy a keychain, we will look at the material, gloss, and elasticity of the keychain. Of course, elasticity is the most important, and it affects whether we will be smooth in the future.