Anodizing titanium generates an array of different colors without dyes. The color formed is dependent on the thickness of the oxide (which is determined by the anodizing voltage); it is caused by the interference of light reflecting off the oxide surface with light traveling through it and reflecting off the underlying metal surface. Colored barbells will fade if you wear them in the mouth. This is not dangerous, but good to know! The most modern machinery, certified production and quality processes, and technical innovations guarantee absolute product quality, maximum security, shortest healing time and smooth workflows during the piercing processes. The perfect body jewellery to achieve maximum customer satisfaction. • 100% Made in Germany • Titanium - Ti6Al 4V Eli Grade 23 - ASTM (F-136) • Ti-Glo® Worldwide unique surface coating • High precision thread • Manufactured to ISO 9001: 2008 and EN ISO 13458: 2003. · AC: 2007