The OTRADO brake disc protector protects brake components and rims when cleaning and lubricating the drive. This makes this otherwise difficult task a breeze. Quick to install. Can be attached in seconds. Free movement of chain and cassette: Allows unrestricted movement of the bicycle chain and sprocket. Prevents dirt on brake discs and pads: protects against dirt on brake components. Safe use of cleaners and lubricants: allows safe use of cleaning and lubricants. Drain and drip tray: safely traps draining liquids in a tray. Reusable: can be used multiple times, environmentally friendly. This product is only for bicycles and motorcycles.