Silicone Breathing Mask 1. Silicone tube pass by FDA .LFGB.SGS.UL 2.Tube is Non-toxic and good stability 3.Size can be orde 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 FinishMaterial:We use carious kind of ...