Hinged Segment Hoop, titanium, 10mm inside, 12mm outside, earring, nose ring, piercing ring 16g (1.2mm wire) Solid G23 Titanium.ONE RING for this listing. Size: 12mm (1/2") outer dimension, 10mm inside.INCLUDES Velvet 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