Voice Coil Size: 2″ Magnet: Ferrite Magnet Weight: 45 oz Materials Frame: Steel Basket Cone: Paper with Glass Fiber Surround: Foam Edge Voice Coil Former Material: Black Aluminum Diameters Mounting Cut-Out: 9.13″ (232mm) Mounting Depth: 4.45″ (113mm) Overall Diameter: 10.23″ (260mm) Net Weight: 3.5kg The Select Series Subwoofers come in 8″, 10″, and 12″ in black steel baskets. DS18 understands the demands of many inexperienced car audiophiles and fiscally responsible deal-finders. These subwoofers’ success relies in their ability to deliver better quality and RMS power than all other entry level offerings of their competition. Highlights Loud booming bass with an amazing price point that will shake the ground around you. High Quality ferrite motor with aluminum coils for very high power to DB efficiency and loudness. Great DS18 design that never let’s you down and gives you loud bass on demand.