PM2.5 Disposable filters for masks.
Sold in packs of 10 only
Anti-stick non-woven cloth which filters moisture and large particles.
Electrostatic to attract stray particles.
Carbon filter which prevents the transmission of microscopic airborne particles.
Filters last for up to 1 month with frequent use or up to 60 hours (whichever is sooner). Masks with these filters are not medical grade.