Park Tool GSC-3 Drivetrain Cleaning Brush

Park Tool GSC-3 Drivetrain Cleaning Brush Specially designed brushes for cleaning hard to reach areas on most bicycles Dual-sided brush specifically designed for cleaning hard-to-reach areas of the bicycle drivetrain Long, stiff bristles are narrow enough to reach between the gears of tightly-spaced modern cassettes Slim contoured end is capable of picking grit and grime out of tight spaces such as derailleur pulley wheels WARNING: California Proposition 65 This product contains chemicals known to the State of California to cause cancer, and birth defects or other reproductive harm. https://cambriabike.com/pages/warning-california-proposition-65