White ceramic is a beautiful material. The material is quite hard and doesn't scratch easily. It provides a very bright background for any inlay. Ceramic is a brittle material that can be easy to crack if not cared for correctly. We recommend using two layers of electrical tape wrapped around the mandrel. If the ring is slipping, you can use two dabs of super glue to glue it to the mandrel rather than over tightening as well. Note: Each ring blank has the material type laser engraved on the interior.