Genuine Brembo spare part. This high-quality replacement oil level inspection window is designed for Brembo OE integrated reservoir master cylinders (front brake or clutch). It ensures a clear view of the hydraulic fluid level for safety and maintenance. The kit includes: 1x Sight Glass lens (Article: 110.4533.10.1), 1x Internal O-ring seal (Article: 110.4533.10.2), and 1x Metal tension ring (Article: 110.4533.10.3). Ideal for restoring masters cylinders on Ducati, Aprilia, and KTM motorcycles without replacing the entire unit.