The 3M 7093 HEPA Filter is approved for environments containing certain oil and non-oil based particles. Use with 3M Respirators 5000 Series or 3M Cartridges 6000 Series with 3M Adapter 502, 3M Facepieces 6000 Series, or 3M Facepieces 7000 Series with bayonet filter holders. Comes in 4 pack, 60 per case.