Flat black ceramic comfort fit ring specially designed to act as a liner, or core, for a softer material such as acrylic, wood, resin...etc. Comfort fit means that the inside of the ring is curved, not flat, making it much more comfortable to wear. This ring is 8mm wide from edge to edge, with a very shallow 1mm wide channel in the middle and rough outer surface to allow for extra bonding surface with the material to cover the ring. The thickness is approximately 1mm making them the perfect…