How big is a 00 gauge

00 gauge (double-zero or 2/0, also written as 00g) measures 10 mm (3/8 inch) in diameter when referring to body jewelry sizing standards. In the gauge system for piercings and body modification, the progression continues beyond single-zero (0G = 8 mm) into multiple zeros: 00G = 10 mm, 000G (triple-zero) = 11 mm, 0000G (quadruple-zero) = 12 mm, continuing upward approximately 1 mm per step.

This represents a large piercing size requiring significant stretching time and care to achieve safely—starting from standard earlobe piercing (typically 18G or 20G at roughly 1 mm) to 00G involves gradual stretching over many months or years, with proper technique essential to avoid tissue damage, blowouts, or permanent disfigurement. The 10 mm (00G) size is popular as an endpoint for stretched earlobes as it's generally considered small enough to allow partial shrinkage if jewelry is removed permanently, though individual tissue elasticity varies greatly. When purchasing body jewelry, always verify both gauge designation and millimeter measurement, as slight manufacturing variations exist and proper fit is critical for healing, comfort, and tissue health. The inverse relationship of the gauge system (where 00G is larger than 0G, which is larger than any numerical gauge like 2G or 4G) can be confusing—remembering that adding zeros increases size helps navigate body jewelry sizing, while millimeter specifications provide unambiguous dimensional reference.