Face Mask Filter

This product is consist of 2 layers melt-blown, 2 layers non-woven fabrics and 1 layer activated carbon. It can perfect filter dust, haze, anti airborne particles dust, seasonal allergies, pollution, ash, gardening pollen and so on, suitable for most occasions. This PM2.5 filters can be used with most dust masks, washable face masks, reusable masks, cloth face cover, face mask with nose wire and filter pocket, neck gaiters and face scarves through quick insertion. PM 2.5 anti-dust filters are disposable and not washable. It is recommended to replace it 1-2 times a day. 4 3/4"L x 3 1/8" W.