The 16 gauge curved barbell is made from high polish grade 23 titanium (Ti 6Al-4V ELI ASTM F136) with internal threading. Both cz ends are removable. The 4mm end is a half ball, while the 3mm end is more of a complete ball shape. These cannot be returned or exchanged if you select a custom anodized barbell color. Only the high polish (plain silver) is eligible for our return policy. Choose your size and color below.