Park Tool Cleaning brush GSC-1

The GSC-1 cog cleaner, featuring a sturdy nylon brush and a sickle-shaped rasping edge, removes the coarsest dirt from the cog, derailleur, chain, and other areas of the bike. This helps prevent premature wear and ensures smooth and safe operation of the respective components. Its compact size makes it a practical companion for on-the-go use. Made from flexible, durable nylon.