Chain Star “extrem“ is white lubricant for chains. The lubricant flows easily into the open spaces in the chain, where it stops moisture from entering;it lubricates the chain and protects it against rust. It is also suited for O-ring chains. Compared with the Normal agent, it contains more adhesive components and is therefore well suited for the chains of mountain bikes operating in extreme weather conditions of water, mud and snow, as well as high speed motorcycles. It is highly waterproof. If applied correctly it is problem-free when used in a dusty environment.