These injectors are Rebuilt by BOSCH using brand new components (nozzles, control valves, solenoids, etc.) These are the most up to date version of the previously troublesome LB7 injector. These feature an updated body that corrects cracking issues that were common in early LB7 injectors, as well as hardened chrome plated ball seats that are much more resistant to internal erosion. These are the exact same GENUINE BOSCH injectors you would get from a GM dealer, at a fraction of the price. They are the highest quality, most reliable injectors available for the LB7 Motor. Each injector comes with a one-year warranty. Each Injector is sealed and individually packaged including O-rings and copper crush washers necessary for installation.