Product introduction: This product is composed of polypropylene non-woven fabric (inner layer, outer layer), melt-blown non-woven fabric (middle layer), nose clip, mask belt; clinical medical personnel use it in invasive surgery to cover the use The person's mouth, nose and jaw provide a physical barrier to prevent direct transmission of pathogenic microorganisms, body fluids and particulate matter. Ethylene oxide sterilization, one-time use.