The Racingboy E2 master cylinder kit is a one piece master cylinder brake pump to replace the stock item on many underbones. Topped off with a beautiful CNC aluminum fluid cover that will not fade over time. The anodized brake lever is also billet machined aluminum and will not snap off during a fall. Cylinder is integrated with the together with the brake fluid reservoir to keep things compact. Also comes with a 10mm mounting socket for the side mirror. This master cylinder kit can be fitted to a universal selection of bikes with a 22mm handlebar.