The Beringer Aerotec CRO8 Master Cylinder is CNC machined from billet aluminum and then anodized for an attractive finish. It's a great upgrade for improved clutch feel and easier lever modulation. Radial mounted Ø12.7mm piston is 40% more efficient with radial orientation. Ball Bearing-Mounted Lever means less hand effort and higher precision feel. Integrated fluid reservoir is less prone to crash damage, unlike remote reservoirs. Multiple colors available; - Anodizing - Black, Blue, Gold, Green, Orange, Purple, Red, Silver, Titanium.- Plating - Nickel, Chrome. FLUID COMPATIBILITY: The internal seals are safe to use with DOT4 racing brake fluid and mineral oil. NOT compatible with DOT5 brake fluid.***Brake fluid is preferred as it does better with higher heat so it can provide a more consistent feel as a result. If your bike came with a mineral oil system, you cannot change to brake fluid unless you change the slave cylinder as well. We recommend the Oberon clutch slave cylinders.*** BIKE COMPATIBILITY: The CRO8 is great for smaller displacement motorcycles, like a 250-500cc supermoto. If you have a larger displacement bike, we recommend the larger CRO9 which has 14.5mm piston.