【※Set of 2】Captive Bead Ring 2G (6mm) with Spring Ball This is a type of body piercing called a CBR. The ball has a spring, so it can be attached and detached without special tools. Although unused, it has been opened for photography. Material: Stainless steel Gauge size: 2G (6mm) Inner diameter: Approximately 10mm Diameter: Approximately 16mm If you have any questions, please feel free to comment.