Full gas mask
1. Mask with Gas-guide tube and a Canister with build-in transmitter for the convenience of talking when working.
2. Size of Canister: big, medium, small
3. Length of Gas-guide tube: 0.5m, 1m, 5m, 10m, 15m, 20m
4. Material of mask body:natural rub... - Update: 2013-07-30