Descriptions: 1. Movement structure of the upper cartridge, increasing the balance of upper and lower bearing, avoid the cartridge frict with the back cover when it rotating. 2. 4-groove design of the cartridge makes the gas smoothly flow from the inside cartridge, to reduce the noise and protect the normal revolution. 3. The neck is 9.1mm, which can help dentist easily to treat each site in the patient's oral, which can improve dentist's treatment efficiency. 4. Built-in anti-retraction system is to prevent the blood, viruses splash into the hand piece head, which increasing the service life of the hand piece
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