The Pioneer TS-SWX310 is a 12" subwoofer enclosure that comes preloaded with one 12" TS-SW301 subwoofer. For information on the subwoofer itself please see the Pioneer TS-SW301 report. The enclosure is slim-designed especially for use behind seats in pick-up trucks, SUV's or anywhere space is limited, and is made of reinforced medium density fiberboard (MDF). It is also wrapped in high-quality black carpet and has an embroidered Pioneer logo.