One 3 inch (76.1 mm) polypropylene driver with butyl rubber surround. Weatherized components for indoor/outdoor applications. Theft- and corrosion-resistant mounting mechanism with an indexed swivel-joint for precision aiming in any direction. Ultra-low profile ZeroReflection ABS enclosure (4 inch diameter by 3.5 inch deep, including mounting plate). Corrosion-resistant, powder-coated aluminum grille. UL 1480 (UEAY) approved.