Used rails, copper wire scrap, copper cathodes, aluminum ingots.
NIOSH is a leading medical insitution in the United States. Masks which are approved by NIOSH are guaranteed to have the highest quality and effectivness. Made of high quality non-woven fabric, FFP2 filter material and electrostatic cotton makes breathing smoother. The design is comfortable, the texture issoft, and the surface is tightly matched. It can effectively prevent the invasion of harmful particles, viruses and bacteria. This mask is effective for both medical and private use
