The stars of our line-up of speed changers and reducers are the variable-speed pulleys that give our firm its name. The speed of devices can be controlled easily by simply changing the pitch diameter of the belt that transmits the power to a belt-driven pulley. Since speed is controlled mechanically, maintenance is simple, power can be reliably transmitted, and speed can be controlled securely. These include units that combine motors and speed reducers, models that use brake motors, and speed reducers that use hollow or solid shaft. These can provide not just speed control, but reliable power transmission under complex control methods.