The product consists of 60g polypropylene nonwoven fabric on the outer layer, 25g polypropylene meltblown fabric on the second layer, 60g polypropylene nonwoven fabric on the third layer and 25g polypropylene meltblown fabric on the fourth layer. The inner layer is composed of 25 grams of polypropylene non-woven fabric, they can filter out 95% of non-oily particles
