layer: non-woven fabric (outer layer) The second layer: melt blown cloth The third layer: melt blown cloth (The two layers of meltblown cloth of the second layer and the third layer are glued together) The fourth layer: non-woven fabric (inner layer) Type: ears wearing Size: 20.5cm*8.5cm Applications: life, factory,workshop,SPA,shopping,school,working places,etc Product features Advantages of fish masks: Comfortable to wear. filtering effect, especially for extremely fine particles and dust.Fits a variety of face shapes. High-quality protective effect. Its protective effect is the same level as KN95 mask, FFP2 mask. Applicable to a variety of environments where protective masks need to be worn for a long time, such as factories, schools, companies, shopping malls, sandstorms, construction s,, parks, etc.