Material: non-woven fabric + activated carbon + melt blown cloth Brand new high quality feature: 1. With 5 layers of particulate filter, it can help filter gas from paint, second-hand smoke, dust, smog, vehicle exhaust, etc. 2. Use activated carbon and breathable fiber. 3. There are two ventilation holes on both sides for better ventilation. 4. Effectively remove and absorb harmful gases. 5. Dustproof. 6. Easy to use. 7. Suitable for cycling, racing, skiing, fishing, snowboarding, rock climbing, etc. Package Included: 1/5/10/20 mask filters note: 1.1 cm = 10 mm = 0.39 inches. 2. Due to manual measurement, please allow an error of 1-2mm and make sure you don't mind before ordering. 3. Please note that due to the different positions of the pictures, the colors may have chromatic aberrations.