Quantum Pro GUARD7air filter by aFe Power is specifically designed for the Quantum Series cold air intake systems and feature an injection molded base and top for lighter weight and rigidity. The newly designed base includes a built-in, 3-angle velocity stack for smooth, even airflow. The Quantum Pro GUARD7filter is a 360-degree radial flow air filter with Five layers of progressively finer mesh cotton gauze oiled media and two layers of synthetic media for maximum protection. Captive screws are included to eliminate lost hardware and to securely fasten to the Quantum Intake system housing.