... 1) Roller Chain Gears and sprocket 2) Standard, customized gear; 3) Made from steel alloy; 4) Heat treated; Roller Chain Gears ... sprocket2.MaterialStainless steel, aluminum alloy; Brass alloy; Tinplate, copper;3.Machining processesForging ,Maching,Hobbing, Broaching, Driling,Milling,Grounding4.Surface treatment ... metal parts for OEM orders Small Standard or Non-standard electric scooter sprocket wheel