The filter layer of the surgical protective mask The first layer is coated with antiseptics, viruses and bacteria. 2 layers of carbon, eliminate dust and odor, 3 layers fine fabric, 4 layers of air. Shutterstock .eps vector - The filter layer of the surgical protective mask The first layer is coated with antiseptics, viruses and bacteria. 2 layers of carbon, eliminate dust and odor, 3 layers fine fabric, 4 layers of air. - ID: 1667491021