1.Black, high, strength, reinforced Bakelite, resistant to solvents, oils greases and other chemical agents,

2.making this knob for using on medical machines, equipment for the food and pharmaceutical industry 

3. wherever hygienic, climatic and environmental factors or laws make it mandatory to use corrosion resistant magerials.

4.Different colours, different sizes, luminous appearance special size can be made it feels soft with the best quality and the style is neoteric,it is used by all kinds of machinery widely.

5.they can help us to operate machinery more convenienty.