Compatible with most stock and aftermarket 4- and 6-piston calipers. Utilize late-model OEM seals for great performance and quick serviceability. Contain nylon bearings and spring loading for smooth, no-rattle operation and long-term performance. Include a recessed cover with a flex-type seal for leak-proof operation. Fit up to 1-1/2″ diameter bars. Work with standard throttle and hand grip components. Brake assemblies and clutch assemblies sold separately. Made in the U.S.A..