Reusable-just replace cartridges/filters when used to capacity. Head harness assembly and spare parts available. Use with 3M™ Filters 2000 Series, 3M™ Filter 7093, P100, 3M™ Cartridges 6000 Series, or 3M™ Dual Airline Systems against a variety of gases, vapors, and particulate hazards according to NIOSH approvals.