20PCS PM2.5 Activated Carbon Filter Insert5 Layers Filter Paper Breathable carbon filter for mask-Ship from USA-

Size Measurement: The size of the pm2.5 mask filter is approximately 4.7 x 3.2 inches, compatible with most face mask, easy to insert or replace the original one. Safety Protection: Filters for face mask are ideal to protect your mouth and face from dust, haze, allergies, pollution, ash, pollen, gardening, crafts, pm2.5, vehicle exhaust, woodwork and fumes. Easy To Use: Just put face mask filters in the mask. Filter insert can not be cleaned. When film or sticky sediment stains emerge, please replace the filter. High-Quality Materials: Our pm2.5 mask filter insert are made of activated carbon and non-woven melt-blown filter cloth, 5 layers filter system effectively keep away from pm2.5 and a range of airborne contaminants. PM2.5 Masks Filter: 100% brand new and high quality. Face mask filters are compatible with majority of face masks available in the market. Application: Anti-dust, Smoke, Pollution, Ash It is recommended to replace the filter after a maximum of one week to achieve the best results. Comes with 30 Pieces PM 2.5 Activated Carbon Filter. Buying multiple pieces is more cost-effective and suitable for sharing with family, friends and neighbors.