The Grunge Brush is the first specifically designed brush that cleans motorcycle and ATV chains. The Grunge Brush has an innovative design that cleans chain from three angles at once. A long handle keeps fingers away from chain and brush bristles will not harm O-Ring or X-Ring chains. The long bristle side gets into those hard to reach areas. Replacement brush set for the Grunge Brush. Comes with 3 short replacement bristles and one long bristle. Make your Grunge Brush like new again.