Blueline USA boxes are available in 8", 10", 12" sizes. BlueLine USA design features a solid axle with wheels placed inside the joint compound path. The pressure plate is hinged for smoother operation. BlueLine flat boxes are slightly larger than some style boxes, and allow for greater joint compound capacity. Cleaning is easy, unscrew the thumbscrew and your pressure plate pops open, spray with water and lightly oil with LPS2 or equal