The Symetrics flat frame Aluminium. The frame consists of a billet CNC machined 7075 aluminium core. The stainless steel bolts (made in house and cnc machined) are used not only to hold the wheels, but also to hold the plastic walls on the side. By using the bolts we do not need any additional screws on the outside of the frame, keeping the typical Symetrics clean look and simple design. No costs have been spared to create this frame.