Particle Filtration Efficiency (PFE): Up to 99% Aerosol Type: Non-Oil Color: White Size: Universal Exhalation Valve: No Strap Attachment: Ultrasonic welding Adjustable Nose Clips: Yes Standards: KN95 (China GB2626-2006) Features: 3D Foldable Design Particle Filtering Efficiency (PFE) 95% Elastic Ear-loop Adjustable and Invisible Nose Clip 5-Layer Protection (high-quality nonwoven fabric, hot air cotton, and melt-blown fabric) Soft Fabric and Comfortable to Wear - Manufacturer certification: FDA - Bacterial filtration efficiency: >98% - Particular filtration efficiency: >95% - Maximum Fliter Efficiency : >99.21 - Minimum Filter Efficiency : >95.17 - Content: 20g Non-woven pp outer layer Layer; 25g Meltblown Fabric 1st filter layer; 20g Meltblown Fabric 2nd filter layer; 20g Non-woven pp liquid resistant layer; 20g Non-woven inner layer - Style: Latex-free elastic earloop