These nipple tubes are ?? in diameter, made from 316L surgical grade stainless steel. The barbells are 14G (1.6mm) 5/8? in length with 8mm long externally threaded spikes. The nipple tubes have unique spikes attached around the outside, with a rounded edge for a different look. Each spike is 8mm in length. These nipple rings are well crafted items, polished to a mirror shine. Brand: FreshTrends Age: Adult Condition: New