SpinPower Drivetrain Brush Set is designed for cleaning grease and grime from cassettes, chains, cogs, derailleurs and chain-rings. The unique, jagged scrapper cleaning tool fits between sprockets and cogs and is used where bristles cannot reach.  Made with solvent resistant & durable materials, each brush is approximately 8.7 inches (22cm) long. Plus, this brush set works perfectly with SpinPower cleaner and degreaser products!