Box built by BJ Fisher. Has removable port. One port tuned to 26hz and the other is 40hz. Only the 26hz port is painted. Was built for a TC Sounds 5200 15. I have run a 5200, Oz Power, TC proto, DC LVL4, SS SPL170, and a LMS4000, RD Audio Alpha, Kove U2 in it. Workes well will just about any driver due to being able to build different port for different drivers. The TC Sticker can be peeled of. Has a place for a plexy window on one side. I'm the third owner and I was lucky to get it carpeted and painted . Box has been around! Made of trupan and is nice and light but still very stiff and well built. External deminsions are 18"tall x 16"deep x 38"long. Has a tripple front baffle with sub flushed in and a double baffle for the plexy window. Internal volume with out port is 4cft. Drops to 3.25 with the 26hz port. Asking $150 plus shipping through UPS pick up would be great and can deliver within a 100miles for gas $'s