Each Blox Racing manual boost controller is constructed of billet aluminum components as well as stainless steel. The unit uses a ceramic ball for accurate boost control and response. Also included are two different springs, the softer of the two is for lower boost while the stiffer is best when used on high boost applications. Boost control is easily adjusted with the accurate boost dial which operates and adjusts smoothly, but will not slip and cause boost settings to change. It doesn't get more simple than a Blox Racing MBC and at this price its hard to beat!