TITANIUM Hinged Segment Hoops,PAIR, 16 gauge, 12mm outside diameter, about 1/2",septum ring, piercing ring, keeper bag, polish cloth 16g Solid G23 Titanium - One PAIR (two pieces) Size: 12mm (1/2") outer dimension, 10mm inside.INCLUDES Keeper Bag Hinge locks/snaps into place for seamless secure fit. Septum piercings, ear piercings,nipple piercings. Where/how you use depends on your piercing size, location, and preference