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 approved1 BOX = 20 FILTERS (NOT PAIRS)