Includes one (1) VF3500 Fine Dust Filter for RIDGID Wet/Dry Vacs., Fits all RIDGID Wet/Dry Vacs 11 to 17 Litres (3 to 4.5 Gallons)., Durable 3-Layer Filter Material - Best for sawdust, dirt, drywall dust, cement dust, cold ashes, and fine powders., Patented Qwik Lock Filter Fastening System - Makes installing or removing your filter quick, easy, and secure., Clean and Reuse - Rinse with water and fully dry to extend the life of your filter