3" Inlet x 10.5" Long for Truck Clamp-On Cotton Gauze Tapered Cone Round Air Intake Filter (Red) Filter consisted of 2 layers to double the filtration efficiency. Improves up to 95% filtration efficiency. Micro cotton gauze type filter material, washable and reusable. For intake or turbo usages. Overall dimension: 10.25" (Length) x 6.25" (Diameter) / 3" filter outlet