The second level of ProTeam's Four Level Filtration, Micro Cloth Filters are essential to helping collect at least 99.9% of indoor pollutants one micron or larger. To safeguard the Indoor Air Quality of your facilities and to optimize the performance of your vacuum cleaner, only use genuine ProTeam filters. To be used with ProTeam's round 10 quart backpack vacuums: CoachVac, Super CoachVac, MegaVac and LineVacer.