Wildcraft Polypropylene Reusable Mask (Black, Without Valve, Pack of 5) for Women Mask is reusable up to 30 gentle hand washes tested as per standards set by BIS (Bureau of Indian Standards) 95%+ Particle filtration efficiency (PFE) for over 0.3µm (micron) size particles & Bacteria Fluid splash resistant test on Hydrostatic head test for up ...