Lead-This 37mm, MCE cassette is .8µm mixed cellulose ester and is specifically designed for lead sampling. TEM-This 25mm, .45µm + -5.0µm cassette is designed for asbestos final clearance testing. The cassettes incorporate a 2" static conductive extension cowl and meets all applicable standards. PCM-A 25mm cassette with .8µm pore size for asbestos sampling. The high quality cassette incorporates a 2" cowl and meets stringent quality standards.