Thank you for viewing! A segment ring from picollet. Platinum, 16G, 6.5mm. [Size (from the website)] Material: Platinum 900 ※Stamped with Pt900. Inner diameter x Outer diameter x Thickness: 6.5mm x 8.9mm x 1.2mm It clicks in securely. The seam is also inconspicuous. I wasn't very good at taking it off, so I didn't use it much, but it's recommended for those who leave it on. It will be cleaned with precious metal cleaning solution and shipped via Yu-Packet Post Mini.