Headbands are easy to adjust and comfortable to wear With flexible cover,this half facepiece will be perfect with any face shape The flow valve helps to dissipate heat and moisture, which helps to reduce user fatigue Suitable for many occasions: (1) Sawing Work (2) Epoxy Resin Work (3) Grinding Work (4) Wood working (5) Mold Removal Work (6) Suitable for production in cement factories, cleaning, power plants, stone processing, polishing, interior design, sawdust, wood processing, lead paint, wall art, powder processing, etc. Product Type:reusable When you feel that the breathing resistance is obviously too , the human body feels uncomfortable, or the filter is dirty or damaged, the filter cotton needs to be replaced immediately. Note: the 2091 Filter Cotton cannot be washing. Note: The product cannot produce oxygen, please do not use it when the oxygen concentration is lower than 19.5% Material: silica gel colour: As shown Package Contents: 1 x respirator 2 x filter cotton Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.