Faceted hinged segment ring made from durable ASTM F-136 titanium. Size is 20G with several inner diameter sizes to choose from: 1/4" (6mm), 9/32" (7mm), 5/16"(8mm), 11/32" (9mm) or 3/8" (10mm). The hinged design makes this piece easy to put in and take out. Sold individually (1pc).