... materials:1045(C45 steel)2\competitive price;3\shaped by CNC, more accurate size, more smooth running;4\heat-treated ... high frequency quenching, twice abrasive resistance as much as common sprocket;hardness5\OEM offered, only you offer the technical drawing, ... , Dull polish, Painting, Electrophoresis Paint,black oxide, with the CNC machine line in the surface or as your requirementPackingBlister card ...