Discontinued, get them while you can. This flat back Shrag Rondelle from Preciosa Crystal is a round metal component with rhinestones set in the rim. The center area allows the designer to use a flat back crystal, pearl, or genuine stone to create a completely unique look. The center fits a ss30 (6.4mm) center stone. Use these great pieces to make buttons, pendants, earrings, pins and more.