These Rainbow Aurora CZ Steel Stainless Circular Barbell is crafted from 316L stainless steel with Rainbow Aurora CZ gems and a choice of 4mm or 5mm ball sizes. It is externally threaded and sized 16G or 14G with inner diameters of 3/8" (10mm) or 1/2" (12mm); perfect for healed piercings. Sold individually (1pc).