This respirator filter is designed for use with 3M respirators, including the 3M 6000 and 7000 series respirator face-pieces. May also be used in addition to a 3M respirator cartridge when attached with a 3M 501 adapter. This respirator filter is often used in spray painting environments. These filters are NIOSH certified to have filter efficiency level of 95 or greater protection against oil and non-oil based particulates. Ten filters per package.