Implant Grade Titanium Internally Threaded Prong Set Natural Stone Belly Button RingMade with ASTM F136 implant-grade titanium. Tested for utmost safety and ease of use in professional body piercing applications.Material: TITANIUM 6AL-4V-ELI ASTM F-136Natural StoneGauge: 14Length: 10mmBall Size: 5 & 8mm