Silicone Rubber Breathing Mask: We use carious kind of polymers like NBR, NR, SBR Silicone, Neoprene etc Silicone Rubber Breathing Mask Material NBR, NR, EPDM, FKM, SBR, Silicone, Neoprene or Custom Size According to the 2D or 3D technical drawing or samples Color transparent,black,any color Duro 30~80 Techniques designed by 3D high accuracy, small error Finish Applications: Mechanically protects ...