Description Ceramic Bearings are 25% harder than conventional steel bearings but are only half the weight. Because frictional wear between the ball bearings and the bearing retainer is significantly reduced the efficiency and durability is significantly increased. Transmission 1:1 (blue contra-angle)Efficient with single spray and internally conducted spray water and spray airEfficient access thanks to even smaller head Improved visibility thanks to the 25,000 Luxglass rod light conductor Good ergonomics, good balance Water Spray 1 Spray The Clean Head System has an anti-suck back mechanism that stops blood and foreign matter from entering the head from the oral cavity. As a result, the ball bearings and mechanical parts last longer.