1. We have been certified from KOSHA(KOREA OCCUPATIONAL SAFETY HEALTH ASSOCIATION), and we have the grade of 1st class dust efficiency, generally 2nd class efficiency for industrial and KN95 style. 2. This mask has very goods shape for the man and woman and good fashion to be coordinated any style of wearing the cloths. 3. It is extremely comfortable for the face, it is from good and computerized shape design and inner plastic frame. This inner frame is rolling to sustain the mask shape and make a help for the homogeneous filtration, filtering efficiency and sustain a good shapes. 4. The inside facing part is wide and soft rubber and it could prevent leaking in the working or conversation leaking. 5. It has the shape of universal fitting and universal adjustable through inner rubber line, even if it is fittable for the children.