All of the bezels are made from 26 gauge (.016") fine silver. The tabs that protrude from the bezel's base allows a mechanical connection with the metal clay providing a secure bond. The feature of the open back allow the use of a pointed back stone. With this application, be sure to clear the metal clay from the open area at the base of the setting to allow clearance for the point of the stone. Sold as a bag of 6.