Improves airflow for better performance and acceleration Oil-free for easy quick servicing and yet washable/reuse able air filter for long service life with life-time Pro DRY S Three-Layer Progressively finer porosity synthetic media for high airflow with high filtration efficiency. Tall, Rounded, evenly-spaced pleats for maximum dust holding capacity Flange: 5-1/2” ID, Base: 7”, Top: 5-1/2”, Height: 8”