Implant Grade Titanium Internally Threaded Prong Set Belly Button Ring Jewelry materials are certified for body piercing. Piercing Size: 14GA (1.6mm), 3/8" (10mm) Style: Non Dangle Belly Button Ring Material: Implant Grade Titanium. TI-6AL-4V ELI ASTM F136 Gemstone: Highest Quality 5A Cubic Zirconia