material: Made of super strong metal, and strong. Type: Polished circle. The ring is exquisite in workmanship, the is smooth, and the edges not scratch your hands and objects. Very suitable for DIY: can be used to make key ring pendants, bag pendants and other accessories. You can use your imagination to make key chains yourself, and make pendants for mobile phones, bags, wallets, etc. Easy to use: easy to carry.