The GSC-1 Park Tool chain brush is made of durable nylon and has a unique design with a long, comfortable handle and a toothed curve that cleans perfectly between the sprockets. In addition, it has stiff bristles that clean the derailleur and chain. This brush Park Tool prevents wear and tear on your chain and freewheels and works perfectly with brakes or other elements that accumulate dust. It has the ideal format to take it wherever and whenever you want.