These are really neat and useful version of a Captive Bead Ring with a Rubber Ball in place of the Surgical Steel Ball that is normally there. The Rubber ball makes it real easy to remove and put back in, and it also reduces on the weight of the large beads drastically. As with all of our "trojan" pieces, the ring is HOLLOW which really reduces the weight of the piece. These are only available Large Gauges and the ring itself is naturally made from 316LVM Surgical Steel.