Ultimate Support Nucleus-Z Navigator - Complete Studio Workstation Desk with Rack and Keyboard ShelfThe Nucleus Z Navigator is the flagship Nucleus Z ergonomic desk that provides a built in second tier and two (2) four space rack units, as well as ample work area on the desktop surface. In addition to these features from the base Nucleus Z Explorer, The Navigator includes the Nucleus Z Keyboard Shelf, a removable shelf that matches the sleek profile of the desk, and gives you ample space for an 88 key controller, or a combination of computer