DC motors models RS-390 or RS-395, Carbon brush dc motor, Cylinder, Diameter 27.5 mm, length 46mm, shaft 2.3 mm, fixing screw 2-M2.5 mm, Operating voltage: 2.4~36V, At no load Speed 3,000~22,000 r.p.m, Output about 2~60W.  fit for massager, vibrator, vending machine, drill & screw driver, gear head, etc.