1.Efficiency , tightly structure ,durable 2.Can drive in positive and negative direction 3.Can be used in explosion proof 1.P series Belt ... Gears in PV,PW,PT , PV,PW adopts narrow V belt , PT adopts timing belt, its efficiency , durable , compact structure ,drive stable ... ,easy install and disassembly . 2.This series allows drive in both directions ,add the explosion proof motor and anti-static ...