Material:Metal Feature: Each end of the connector is able to surround a ball at the end of the ball chain and snap over its wire connection, which holds it secure. These can be used to connect two lengths of chain, or to connect the ends of the same chain to form a loop. The connectors require no tools to apply or remove and are reusable. These are used for dog tags, key chains, scrapbooking embellishments, general craft, etc. Size: 1.8m long x 2mm wide