4ply Active Carbon Face Mask 1.Odorless, fiberglass-free,low breath resistance 2.Used in factories,cleaning roomes,gardens. Active Carbon Face Mask1. Odorless, fiberglass-free, low breath resistance.2. It is suitable for use in factories, cleaning roomes, gardens and non-poison workshop .3. Manufactured with actived carbon cloth can filtrate bacteria, dust, micro granules, and organic poisonous ...