Painful Pleasures 16g 4 Loop Twister Weight: 0.0048, Threading: External 1mm Brand: Painful Pleasures, Gauge: 16g (1.2mm) Space between twists: 6mm, Ball Size: 4mm balls Material: 316L ASTM F-138 Implant Grade Stainless Steel Overall length from ball to ball: 30mm, Inner diameter of twists: 9mm