Marathon Handpiece Model SDE-SH37LN. Max Speed: 40,000rpm. Torque: 4.5 Ncm

Marathon is one of the oldest manufacturers of micro motors for dental.  the Handpiece Weight: 220g. Dimension: (L)149.3mm x (D)27.8mm. Lesser noise & Vibration. This is one of the strongest and fastest Handpieces out there.