Although they physically resemble a normal coffee filter, the masks are made from different material (making them unsuitable for brewing coffee). The material,

Although they physically resemble a normal coffee filter, the masks are made from different material (making them unsuitable for brewing coffee). The material, a triple layer of melt-blown and spun-blown microfiber, has a Bacterial Filtration Efficiency certification of above 98 percent, a value comparable to simple medical masks. The company has now produced about 10 million masks over the first month...