kn95 face mask dust-proof smoke proof breathable with breathing valve 5 layer protection masks fashion color reusable mouth masks

kn95 dust mask with breather valve, made of non-woven fabric + melt blown cloth, 4 layers of effective protection: the first layer: ss grade 60 grams of non-woven fabric (outer layer), the second layer: 99 grade 25 grams of melt blown cloth, the third layer: 99 grade 25 grams of meltblown fabric, fourth layer: ss grade 30 grams of non-woven fabric, can be used as daily protective products, size: 205*85mm, filtering effect: 95%, function: dust and haze, wearing method : ear wear, weight: 8g. it is comfortable to wear, has good breathability and can effectively prevent dust.