Advanced Electret Media (AEM) provides lightweight, easy breathing comfort Small enough to fit comfortably under welding shields Offer relief from nuisance level organic vapours and acid gases Twist and click for a quick and easy fit 3M™ Bayonet Connection: Flexible system for connection to 3M half and full facepiece Versatile protection against many oil and non-oil based particulate contaminants 3M™ P3 R Particulate Filters 2138 protect against fine dusts and oil/water based mists. In addition, the filters offer relief from nuisance level organic vapours and acid gases. Suitable for use with 3M™ Reusable Respirators featuring the Bayonet filter connection system: 3M™ Reusable Full Facepiece 6000 Series, 3M™ Reusable Half Facepiece 7500 Series, 3M™ Reusable Half Facepiece 6500 QL Series and 3M™ Reusable Halfpiece 6000 Series. For breathing protection against solid and liquid particles, and ozone up to 10 x OEL, get 3M™ Particulate Filters, 2138. They also offer additional protection against organic vapour and acid gases below OEL. Gas & Vapor Protection Type : 10 x TLV and organic vapours/acid gas below TLV, Acid Gas, Organic Vapor, Solid and liquid particles, Solid and liquid particles. Plus ozone protection