... 4.Material: Fluorine rubber,AFLAS rubber ect Hengshui Protecting device capsule,rubber seal 1.Pass ISO 9001 2.Free sample 3 ... factory found in 2001,and specializes in producing Protecting device capsule.The material is Fluorine,silicon rubber,high saturation cube nitrile ... steady,firmly get user's favorable comment. Hengshui Protecting device capsule,rubber seal