Material: stainless steel

Ring Thickness: 5mm
Ring Diameter:19mm
Ball Diameter:8mm
If this existing item doesn't fit you, you can custom one base on what you need.Check this link.

https://www.bonanza.com/listings/Customize-Body-Jewelry-Piercing-Jewelry-Snap-Fit-Captive-Bead-Ring-C-Style/1657397471