All BDS Superchargers are assembled by hand with heavy-duty competition components. The same parts used to assemble our Top Fuel Blowers are the same parts used in all of our blowers. Heavy-duty bearings and special double lipped Teflon seals are used to ensure long life. The heavy-duty bearing plates and cases are machined to precise specifications that produce the most efficient blower possible. BDS Blowers are fully show polished as a standard feature. Unpolished Blowers are a special order.