... copper-zinc alloy, housings made from carbon steel.We supply PHS series including:POS 5, POS 6, POS8 ... buy from us? Reason as follows, 1. We are experienced factory for cold rolled ball screw, ... . Registered with Chinese government, has own workshop, we show our factory by this website link: http://www ... for us. Packing: For small measurement goods, we packing by paper carton. Delivery:1.Sample order ...