Circular Barbells come in gauges 18G through 00G and can be used for initial piercings or healed piercings.

18G and 16G are the smallest sizes and are commonly used for cartilage, rook, tragus and all other ear piercings. They are also popular as a nose and septum ring in the smaller diameters.

14G is commonly used in ear lobes, lips, nipples, septum and genital piercings.

12G through 00G are commonly used in the ear lobes as well as nipples and genital piercings.