PM2.5 Activated Carbon Replacement Filter for Face Mask - Set of 10*Five layers of support that contains non woven fabric, activated carbon and melt blown filter. Five layer filter system effectively keeps away from PM 2. 5 and a range of airborne contaminants. *Filter cannot be cleaned and should be replaced every week. *When film or sticky sediment stains emerge, please replace the filter. *Compatible with majority of face masks available on the market. Wholesale 100 pcs @ P12 each 1,000 pcs @ P10 each