Protective Grade : N95 Filtering Rate: ≥95% (0.075μm particles) Examination Standard : NIOSH Standard Wearing Type : Ear Wearing Type (9501) Masks Shapes : Folding Quantity:20Pcs/Set In Box 1.This respirator is for at least 95 percent filtration efficiency against certain non-oil-based particles and aerosols. 2.Four-layer design, filter the pollution, gases, odors, dust, pollen, smog, PM2.5, germs, bacteria effectively. 3.3D and light weight design, the initial pressure drop makes you breathe easier. 4.High-quality elastic earband, easy to wear and comfortable. 5.Delivery Time: within 7 days.