http://tinyurl.com/mn2c4gp<P>3M AO Safety/3M Tekk 50538 N9520 Lightweight Filters for 8000-Series Cartridges, 10-PackProduct Review<P> Click on the link for more reviews<P>NIOSH approved<P>Filter is 95% efficient.<P>Protection from solid and liquid particles that do not contain oil.<P>Use with AO Safety 8000 Series respirators and cartridges.<P>Contains 5 pairs of cartridges - 10 units total<P>
