100% fiberglass sub enclosure. This is our first 10 inch designer sub enclosure. Our goal was to create a compact design which would take up the least amount of trunk space, so we slanted the back of the box to fit tighter against the back of the back seats. The Protégé's design is a compilation of aspects from each of the designs we've create before it. Great acoustics and very compact with a great look- all incorporated into a 10 inch sub enclosure. Like all of our enclosures, it is available with integrated ports, or sealed; shared, or separate airspace; and has an option for integrated terminals. With a total airspace of 1.5 cubic feet, it will accommodate most 10 inch subwoofers. Dimensions are W31XD12.5XH12.5.