As a responsible producer who cares about car-owners� health, our company Dongguan Last & Long Filter Co., Ltd uses high-grade filtering materials (coconut shell active carbon compounded material, nanometer silver-plated material with anti-slim technology and long fiber, anti-static electricity material with pinholes, doubled-effected net-grid filtering material). The product boasts evident effect and there�s no second-time pollution when unloaded after warranty duration. Every customer can be at ease using our products.Last & Long cabin/air filter is high quality professional products. Besides filtering dust, impurity, fine granule, various industrial gas, eliminating respiratory system disease due to contaminated air , it can also stop pollen from going inside and glass fogging, as well as use air-conditioning system and clear dirty air in car, keeping the air inside car refresh and clean.Researchers in Hanoverian Medical College of Germany found out that auto air-conditioning system can dispose 80% of the bacterium, fungus and granule from outside, which is very good for people who have respiratory disease and hypersensitivity. Meanwhile, researchers emphasize that continuous reasonable protection and maintenance on auto air-conditioning system is very important, therefore, air-condition filter must be replaced periodically. Car owners should check air-conditioner as soon as dubious odor smelled.