What is clean head system?Clean head system is specially designed to prevent the liquid in the mouth from entering the head of the handpiece, thus decrease the possibility of cross-infection. Meanwhile the air turbine within the head takes Germany balancing technology, extending the bearing life.Description:1. Precise Monoblock Axes, Ceramic bearing2. 4-water spry3. E-generator LED handpiece4.135°C Autoclavable, Sterilization can be done with High-temperature and High-pressure repeatedly (NO disinfectant or Ultrasonic Cleaner)5. with quick coupler 4-hole connection6. Healthy Machine Head System7. Push Button Needle Change Type8. Clean head system 9. Standard Head10. Warranty: LED Bulb 1 year warranty, Turbine Cartridge 6 monthsFeatures:Model: ALQ-SU M4Head Type: standardRotation speed :330000~400000 RPMAir priessure:0.22-0.25Mpa.Water Spray Type:Quattro SprayBur Type: φ1.59mm~1.60mm Standard BurChuck type:Push buttonHead diameter:Φ12.1XH13.3mmPacking list:Handpiece 1 pcOperation manual 1pcBack cover wrench 1pc