Features: - High speed handpiece: 3 water spray + 3 air Spray. - Chuck type: push button. - Noise: ≤68dB. - Bur applicable: Ø1.59-Ø1.6mm x 21-23mm. - Rotation speed: ≥300,000rpm. - German dynamic balance: Each movement is balanced by a German dynamic balancing machine. the bearing capacity of the shaft is even and stable, the noise is lower, and the service life is longer.