Cover the nose and mouth and hangs the ear straps on both sides of the mouth-muffle on the ear; Fix the bridges of the nose in a nose to prevent dirty air from entering; Pull the mouth-muffle to the lower jaw to create a three-dimensional breathing space. Best wear time is 8 hours. Widely use in the restaurants, beauty salons, nail shops, pet shops gray sky, fog weather and cleaning as well as other environments.
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