★High-quality materials: Made of activated carbon and non-woven melt-blown filter cloth, 5 layers filter system. Easy to use: just put it in the filter opening. When film or sticky sediment stains emerge, please replace the filter. Insert Pocket Filter for Cloth Face Mask. Rapid delivery:  [Five layers Filter Material】- 2 layers non-woven fabric, 2 layers of melt blown cloth,1 layer activated carbon cloth. High-quality materials: Made of activated carbon and non-woven melt-blown filter cloth.★【Filter Size】- carbon filters size measures approx 12 x 8 cm/4.72 x 3.15 inches, Both adults and kids can use it, easy to insert or replace the original one Suitable for men, women, and children ★【Activated Carbon Filters】- high quality. It\'s compatible with majority of mask available in the market, cloth mask, dust mask, outdoor cycling mask, breathing valve, respirator filters, masks with filter pocket, filter face mask, Simple insert use ★【Safety Use】- Against face from Dust, Haze, Allergies, Pollution, Ash, Pollen, Gardening, Crafts, PM 2.5, Vehicle Exhaust, Woodwork, Pollen Allergies, and Fumes. ★Built For The Outdoors - Built for those on-the-go and with busy active lifestyles. Enjoy using the PM 2.5 Filter during: walking, running, biking, etc. Or wear while at: school, office, subway, airport, shopping, etc. PM2.5 Activated Carbon Filter Breathing Insert Mask Filter. The PM 2.5 Filter is the best way to go into the day with 5 whole extra layers of support and security. Our advanced PM 2.5 filter is built with an activated carbon filter at the center to provide support against dust, debris, smog, and more. Installation takes only seconds, the materials are soft, smooth, and breathable during wearing, and it was built for daily activities such as: school, work, public transportation, and much more. Activated Carbon Filter An activated carbon filter provides extra support and every time it’s worn.