A 20-pack of KN95 face masks typically includes disposable, multi-layered masks designed for respiratory protection. They feature a >95% filtration level, adjustable nose clips, and comfortable ear loops. The masks are designed to fit snugly on the face, minimizing gaps and ensuring effective filtration of airborne particles. 
Key Specifications:
Filtration: >95% filtration of airborne particles. 
Layers: Typically 4 or 5 layers of non-woven fabric, including melt-blown fabric for filtration. 
Fit: Adjustable nose clip and ear loops for a secure, comfortable fit. 
Material: Non-woven fabric, melt-blown fabric, and soft cotton (may vary by manufacturer). 
Color: Usually white, but can be other colors. 
Packaging: Usually sold in boxes of 20 masks. 
Additional Features: Some masks may have features like an anti-fog design, individually wrapped masks for hygiene, and a skin-friendly inner layer.