Durable material : Made of ultra strong with silver-toned nickel metal, durable and firm.Polished round ring,great workmanship with the ring,smooth surface and edge, will not scratch your hands and stuffs. Size : Ring diameter is 1inch / 25mm, the chain is approx,1.1 in length, and the open jump ring is 0.4 in diameter. Packge content : It includes 100 PCS key rings with chain and 100 PCS open Jump Rings.It is very great to get bulk items at reasonable price. Great for DIY : The key ring design with chain and connectors, you do not need to buy additional parts. It's practial for making key ring pendant,bags pendant and other accesspries. You can use your imagination to DIY your own keychain, make pendant for phone, bag, purse,etc. Convenient to use : Each one comes with a separate jump ring, you don't have to put extra effort to open before connect something on it, Convenient for you to attach charms on to it,easy to install to make your DIY project simple.