Ceramic Sleeves are recommended for CT scans and cone beam X-Ray machines in order to avoid the X-Ray scatter that often occurs when using metal. 

Thick Wall Ceramic Guide Sleeves (CTWGS) are used for wider, larger teeth, usually in the posterior areas. Like its stainless counterparts, ceramic parts are autoclavable and reusable. Due to the nature of the material, there is a slight variation in the od of ceramic sleeves. Use extra care when handling the ceramic sleeves; they may break if dropped on a hard surface.