Materials: sterling silver

Closed back signet ring, so no gap to irritate your skin with moisture. Band tapers to 3.5mm in the back. Comfortable.

Ps. It's not an error that the sizing jumps from 4 to 7. Those are the sizes available from the vendor.

Shown far right in last photo, with RECTANGLE SIGNET and ROUNDED SQUARE SIGNET.

If item isn't in-store, it will be an additional week ish to ship.