... boxes, worm, worm wheel, servo,mini DC motor ,MIM,etc.LED light with good quality & competitive price We Shenzhen HuaYueXin Precise ... are made of bronze, iron and stainless steel as raw materials, which are as following:gear wheel,worm wheel,worm, metals injection ... of POM,nylon,determined by raw materials.The products concerning as plastic gear wheel include worm wheel and other precise injection ...