Mask with Gas-guide tube and a Canister Size of Canister: big, medium, small Length of Gas-guide tube: 0.5m, 1m, 5m, 10m, 15m, 20m Material of mask body:natural rubber Properties: 1. Efficient Adsorption and Filtration The canister is filled with activated carbon of high quality that can filter efficiently toxic gas such as organic vapors, solvents, acid gases, halogens, sulfur dioxide, ammonia, mercury, fine dust and sprays and so on. 2. Comfortable Wear Silicon rubber is applied in our mask ,which makes the wearer comfortable. 3. Effective Protection The canister is connected directly to the face piece, which provides perfect protection for respiratory organs, eyes and facial skin of the wearer. 4. Perfect Sight Our mask has an unbreakable screening grid which resists shock and smog to ensure a perfect sight. 5. Perfect sealing of contact area Two layers are sealed for different facial forms on the edge. 6. Convenient Communication Build-in transmitter for the convenience of talking when working.