4mm Jump Ring extra-thin, black finish, pk/OunceWhat is a jump ring? A jump ring is a circular wire loop that is cut at one point to allow connection with other wire loops or jewelry components. For example, a jump ring might be used to connect a pendant to a chain. A jump ring can be any shape and size, and be of various gauges of wire. It is often designed to be the weak link in a design, to prevent injury to the wearer if the jewelry piece is caught for any reason.4mm Jump Ring extra-thin, black finish, pk/OunceWhat is a jump ring? A jump ring is a circular wire loop that is cut at one point to allow connection with other wire loops or jewelry components. For example, a jump ring might be used to connect a pendant to a chain. A jump ring can be any shape and size, and be of various gauges of wire. It is often designed to be the weak link in a design, to prevent injury to the wearer if the jewelry piece is caught for any reason.