Are you now troubled by dust chemicals, smoke and particles, Do you want to enjoy a free outdoor life? Common mask ? It has no effect. Moving purifying respirator? It is large and burden That's a good reason to buy this Activated Carbon Dustproof Mask. Refused to be a human vacuum cleaner, wear a dust proof ,anti-haze mask. A Must Have for outdoor activity Suitable for dust, anti-vehicle exhaust, anti-pollen allergy, PM2.5, for cycling, hiking, skiing and other outdoor activities Usually one filter can be used for 30 days, It is recommended to change at any time during flu and heavy pollution periods Package contents: 1 pcs KN95 Filter (No mask) 1 pcs KN95 Mask with 1 pcs KN95 Filter 10 pcs KN95 Filters (No mask) 1 pcs KN95 Mask with 10pcs KN95 Filter 2 pcs KN95 Mask with 20pcs KN95 Filter 3 pcs KN95 Mask with 30pcs KN95 Filter Color:Black/Blue/Orange/Grey/Green/Royal blue/Wine red