JOVIVI 30pcs Horseshoe Circular Assorted Color Surgical Steel Nose Septum Captive Ring 18G 3/8" Length Brand New, High Quality 316L Surgical Grade Steel Septum Qty: 30pcs (10 of each color). Each order comes with JOVIVI Gift Pouch! Pin Gauge:18g(1.0mm) Inner Diameter:10mm. Outer Diameter:12mm Ball Size:3mm