Muc off drivetrain brushmuc offs drivetrain brush is specifically designed to get to those hard to reach areas of your drivetrain such as between sprockets around the derailleur and its jockey wheels and between chainrings and chain links its grip features silicone inserts giving you a comfortable and steady grip and the long durable nylon bristles and paintbrush shape makes applying cleaning products easier features durable nylon bristles reach hard to shift grime silicone inserts provi