... noise customized surface treatment all kinds of plastic planetary gear set and gear Specifications:1) Suitable for various automotive, electronic, ... be as requirements6)Material: iron/aluminum, copper, alloy, carbon steel, 18CrMnTi,20CrMnTi,20Cr,20CrV,1045 steel, others optional7 ... so on, with an output of over 1 million pieces per month. all kinds of plastic planetary gear set and gear ...