All of their implant-grade titanium is domestically sourced and proudlymanufactured in the U.S.A. ● They only use the highest quality genuine and synthetic stones and opals. ● All threaded ends are internally threaded and fit a 14g/12g – 1.2mm and 18g/16g – 0.8mm thread pattern which makes them compatible with most of your favorite high-quality jewelry companies. ● All threadless ends are universal and utilize a 25g titanium pin. ● All titanium jewelry is machined out of certified implant grade titanium (ASTM F-136) Stones are hand polished and handset. ● Lifetime guarantee on manufacturer defects. ● Proud APP corporate sponsors.