Thenice 6 Pcs 16 Gauge 1.2mm Barbell Tongue Ring Nipple Nails Rings Studs (10 mm Bar length) Material: Surgical Steel,Don't inflammation, not allergic. Needle navel ring, can be worn on the ear. Size: ball diameter is 4 mm Coarse rods: 1.2mm Two ball screws are screwed up mouth