These 14 gauge nipple rounders are made from high polish grade 23 titanium (Ti 6Al-4V ELI ASTM F136) with external threading. Diameter refers to the interior diameter of the rounder, not the barbell length. The 5mm balls are removable from both ends of the externally threaded barbells. We're currently offering these in the high polish (silver) finish only. Choose your size below.