Why choose a Q-Logic enclosure? For their musical performance and their unbeatable construction. Thanks to reliable locking-joint construction and exceptionally strong adhesive, these boxes are virtually indestructible. This Q-Logic QB-212.4 dual 12" bandpass box (Type 4) is made from 5/8" fiberboard for strength, and is impeccably upholstered with durable grey carpet. A redesigned grille gives your enclosure a cool appearance. Screws are included for your subwoofers. The box come with wires for the internal connections (with quick-slides attached), with two sets of spring posts that will accept bare wire, pin connctors, or banana plugs. The port tubes are pre-installed. In most cases, you will need to cut the port tubes to length to tune your box, and detailed instructions that will help you determine the proper lengths are included. This box will fit in trunks, hatchback spaces, and the rear area of most SUVs and vans.