DESC: These black chrome monsters not only look awesome, they deliver legendary bass with their chrome-plated polypropylene cones, wide UV-treated foam surrounds, and deep custom-designed steel basket. A bumped and vented pole piece helps keep the motor assembly cool while a stiff poly-cotton spider keeps the hybrid aluminum/Kapton voice coil under control. With its custom 3D molded dust cap and chrome steel outer ring, this sub ensure high quality bass.