Descriptions: This mask completely equivalent to 3M 6800 comprehensive protection function, can used 3M filter cotton, high quality products, low prices, very popular! A large number of procurement, has a surprise discount! We are always here to help. And all messages will be replied within 24 hours except weekends or American holidays. In case of you re not happy with our products or service, please just contact with no any hesitete, and us side would do our best to service for you to satisfatory always.