The AAB Disposable Protective Masks are FDA and CE approved. They are also BFE >99%, PFE>95% test approved. Each box contains 50 blue masks. They are ideal for daily use thanks to its 3-layer protective materials with easy breathability. It is recommended that you change your masks every 3-5 hours. AAB Group was founded in Hong Kong and its factories are located in Fujian, China. With years of experience in the sanitary care products, the company is able to produce quality masks at reasonable prices. AAB is a well-known brand and has sold its products to over 50 different countries around the world.