This set is a stylish collection of horseshoe circular barbells, featuring ASTM F-138 Stainless Steel for durability and hypoallergenic safety. This set includes a mix of classic ball closures, and bold spike designs, catering to a variety of piercings such as septum, cartilage, and lip. The inner diameter from 6mm to 12mm, the barbell thickness comes into 14g(1.6mm) and 16g(1.2mm).