Black PVD (Physical Vapor Deposition) Titanium jeweled discs with M1.2 threading. Stones are bezel set and can be autoclaved. Discs are available in 3mm, 4mm & 5mm sizes. Can also thread into 14g internally threaded jewelry. Manufactured out of Implant Grade Titanium (Ti-6AL-4V-ELI ASTM F136)