1. [ Diameter ]: External Thickness: 16G=1.2mm; Inner Pin: 20G=0.8mm, Inner Diameter: 5/16"=8mm. 2. [ 1PC Piercing Ring ]: Sold as a Single Piece, each item package includes Clicker Hoop × 1, Store Box × 1. 3. [ Suitable Location ]: Helix, Tragus, Daith, Rook, Upper Lobe, Earlobe Earrings, Nose Piercing. 4. [Feature]: ASTM F136 titanium and certified by SGS, suitable for fresh or healing piercings, Hypoallergenic, and 100% nickel-free, 5A Cubic Zirconia. 5. [ Great Idea ]: FINE4U piercing Jewelry will be the new idea ideas for your friends and families on Anniversaries, Birthdays, Christmas, Valentine's Day, and Advent Calendar.