7ZACC 316l Surgical Stainless Steel-16g 3/8-5mm Crescent Half Moon Black Rubber O-ring Septum Piercing Pincher Ring single 16 g steel Metal: 316L Surgical Stainless Steel Size: 16 gauge, 11 mm diameter Always the highest quality 316l Surgical Stainless Steel-black Solid Titanium 16g 11 Mm Crescent Half Moon Black Rubber O-ring Septum Piercing Pincher Ring