Blocks more than 95% of test aerosols with a mass median diameter of 0.3um The mask selected by the Korea Centers for Disease Control and Prevention! The N95 mask, which has been approved by the National Institute for Occupational Safety and Health (NIOSH) in the United States, is also being supplied as a mask for actual medical staff. Triple filter structure with high performance and low differential pressure 1 LAYER SPUNBOND Outer filter with high shape stability 2 LAYER MELTBLOWN High-performance MB filter made in Korea with efficiency of 95% or more 3 LAYER SPUNBOND Soft hypoallergenic inner filter Excellent Adhesion: The head-loop type mask has a higher adhesion than the ear-string type mask, so it is more effective in blocking harmful substances. Ear Pain Relief : Ear pain caused by wearing the mask for a long time can be relieved by wearing a headroof type mask. 25 sheets: Individual packaging + box packaging Size : Large / Length 125mm X Width 150mm