Features:Designed with a non-woven cloth filter to screen out air pollutant like dusts and vehicle fumes.Replaceable and washable filter， and is designed to be effective for at least 3 months in normal daily use.Designed with two one-way valves to allow easier exhalation of heat， water vapour and Carbon Dioxide，suitable for glass wearers.Aluminum lock， help to fit the mask onto nose stably.Made of SBR to give a comfortable and secure fit.Specification:Color: BlackMaterial: Non-woven cloth & SBRProduct size: Approx.51 * 14.5cm / 20.1 * 5.7in (L * W) （folding size）Product weight: 41g / 1.5ozPackage size: 23.5 * 16 * 3.5cm / 9.3 * 6.3 * 1.4inPackage weight: 41g / 1.5ozPackage List:1 * Mask