3M™ Secure Click™ Particulate Filter P3 R D3135 is our CE approved filter for environments containing certain particles. New dual flow cartridges and filters allow for easier breathing, Protects against particulates, Quick, simple connection. Simply align the connections and push until you hear a click, Use with 3M™ Secure Click™ Reusable Respirators 800 Series, Swept-back design allows an enhanced field of view and comfort, Use for protection in hazardous environments, CE approved 1 BOX = 20 FILTERS (NOT PAIRS)