Advanced bio fiber filter that sterilizes fungi and germs up to 99.9% FDA certified and approved filter Sterile single packed Manufactured as a KF94 class model, multi- usable and filter function mask Superior to other regular masks on the market Sterilization, deodorization 7 days of use mask Length 20.5cm, Width 8cm, Ear loop 7cm Multi-use (regular use, patient and hospital use) FDA reviewed, authorized approved Classification: registered and certified as Medical Device Class 1 FDA premarket review: Office of Ophthalmic, Anesthesia, Respiratory, ENT (ear, nose, throat) and Dental Devices, Office of Product Evaluation and Quality