Gauge Size: 16G (1.2mm). These hoops can be used for most piercings including septum, cartilage, etc.
Diameter: 5/16" (8mm), 3/8" (10mm) or 1/2" (12mm)
Materials: 316L surgical steel externally threaded horseshoe. 3mm spike ends on the 8mm, the 10mm and 12mm will have 4mm spike ends.