This is a super unique lava Stone TITANIUM 6ALV-ELI (Grade 23) IMPLANT GRADE belly button ring. This belly ring is 14 gauge and measures 10mm-3/8 inches. The bottom bead size is 10mm and top bead size is 6mm. Titanium navel rings are lightweight, corrosion resistant, and less likely to react with bodily fluids! For extra safety your titanium body jewelry can be sterilized in an autoclave.