The RQJ10D is a dual Sealed speaker box Which is made in the USA with Grade “A” ¾” MDF wood. This enclosure is made with precision cutting machinery by industry experts that have been making these enclosures in the USA for over 20 years. These enclosures are are with bedliner spray making them fully waterproof! They are extremely tough and rugged and will last for an extremely long time. The ¾” USA MDF is much stronger then any type of import wood. This will keep your box performing at an optimal level by not flexing and distorting your woofers. Your woofers will thank you! EVERY RockvilIe enclosure is not only glued at all joints but stapled as well. If that wasn't enough we add a layer of silicon to every seam! This makes your RockvilIe enclosure rock even more! Description of K2 : This accessory package includes everything you need to install two subwoofers into an enclosure, and wire your enclosure to your amplifier. This package is a top of the line accessory package which we put together and tested.