Rubber Strap Foldable Dust Mask with valve 1. EN149:2001 2. Valve available 3. OEM 4. Color available Rubber Strap Foldable Dust Mask ... such as H2S, SO2, H2, N2 and micron dust.3. Adjustable nosepiece and inner foam provide a custom seal for ... manufacturers, processing, environmental sterilizing, and worse workshops.5. Style (with valve/with active carbon) Packing:20pcs/box, 24box/carton.Carton Volume ...