This Jewelled BCR (ball closure ring) or CBR (captive bead ring) is 1.6mm (14 gauge) in thickness with an internal diameter of either 6, 7, 8, 10, 12, 14, 16 or 19mm. It is made out of 316L Surgical Steel and then plated with 18k Rose Gold by us to your specifications. These rings are very popular for navel and nipple piercings as well as ear and other piercings. The clip in ball is set with a Swarowski Crystal in the colour of your choice and the ball size varies dependent on the diameter of the ring that you purchase - please just ask if you would like to confirm the size prior to ordering. The ball has 2 dimples either side which clip into the ring and the pressure from the ring holds it in place.