Thank you for viewing. Picollet segment ring Platinum 16G 6.5mm. [Size (from the website)] Material: Platinum 900 *Engraved with Pt900. Inner diameter x Outer diameter x Thickness: 6.5mm x 8.9mm x 1.2mm It snaps in securely. The seam is also inconspicuous. I wasn't very good at taking it off, so I didn't use it much, but I recommend it for those who wear it continuously. It will be cleaned with precious metal cleaning solution and shipped via Yu-packet Post Mini.