Battery free vibrating jewellery! Rattlebells consist of 6mm diameter balls with heavy metal spherical inserts imprisoned within the titanium casing. The encapsulated ball is three times heavier than the titanium shell and becomes agitated with the slightest motion, causing resonance throughout the barbell. The balls are permanently sealed and cannot fracture. Excellent for tongues, nipples and genitals. 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