Ideal for chains, cogs, and derailleurs, Pedro's durable, double-ended Toothbrush makes quick work of caked on grime. Its ergonomic handle is designed to prevent slippage and busted knuckles, while the tapering-length bristles up front scrub chains, chainrings and cassettes. at the opposite end, stiffer, larger-diameter bristles reach deep between the cassette cogs. The bristles and synthetic handle are solvent resistant. The Pedro's Toothbrush is not recommended for oral use.