This is a durable solid TITANIUM 6ALV-ELI (Grade 23) IMPLANT GRADE belly button ring with mood stone. This belly ring is 14 gauge and measures 10mm-3/8 inches. The top bead size is 6mm and bottom size is 8mm. 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.