Round closed heavy gauge jump rings have become quite popular recently. These rings are made with heavier gauge wire than most jump rings, and they are very durable and can handle heavier adornments. They are a type of cable-style ring that can be used for building jewelry items like earrings, bracelets, hair ties, and so on. The heavy gauge wire allows you to make more complex designs without fear of the rings breaking from a weight differential between them in your design.