Internally threaded circular barbells with two internally threaded spiked end. Made from black pvd on ASTM F-136 titanium. Cool piece for your septum piercing! Available in size 16G or 14G. Available inner diameters include: 5/16" (8mm), 3/8" (10mm), 7/16" (11mm), and 1/2" (12mm). Spiked ends measure about 3mm or 16G and 4mm for 14G. Sold individually.