Two Pack of Glo Germ 8 ounce Gel -- 16 oz total. Our Glo Germ Gel contains proven safe ingredients which simulate the presence of real germs, 5 micros in size. Glo Germ Gel will illuminate under UV light, showing where actual germs would reside. Our gel works best for demonstrations where frequent or numerous uses are required. Pump 1-2 strokes of gel on palms of hands and rub together, including the back of hands. Scrape fingernails on pals to "infect" germs under the nails. Place hands under a UV light to view the "germs." Follow with normal hand washing, then test again with UV light to inspect how well the hands were washed.