The Kramer Electronics SPK-C811 8" Ceiling Tile Replacement Speaker is an easy-to-install 24" (609.6 mm) wide drop ceiling. The units have a perforated steel baffle and integral back box. This easily installable speaker mounts into an existing ceiling tile. A ceiling mount kit is included for a precise fit in any drop ceiling. The 8" (203.2 mm) cone speaker has a 4.8 oz (136.1 g) BeFe ceramic magnet.