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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 rubber
5. Can be equipped with different filters according to the environment.
6. We can supply 200000 sets for this product every month.
