Ongrok Plant-Based FilterTRAPS ODORS This innovative smog and odor eliminator is inconspicuous, closely packed, and specifically tailored to reduce harmful fumes. ENVIRONMENTALLY FRIENDLY Each filter is biodegradable as it is made almost entirely from corn starch! It is best to keep the outer packaging sealed before usage to prevent premature degradation of the product. EASY TO USE The user simply exhales smog into the filter, and the resulting air that comes out is clean!