The Grunge Brush Full and Mini Combo kit contains 1 red full size chain brush, and 1 black mini chain brush. Full size Grunge Brush is great for full size motorcycles & ATVs with 520 thru 630 size chains, Mini chain Grunge Brush is perfect for mini motorcycles & ATVs with 415 thru 428 size chains and is also great for all size bicycle chains. 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. The Grunge Brush uses 3-sided bristles allowing you to clean all 4 sides of your chain and the long bristle side lets you clean other parts of your bike like sprockets and wheels. Easily adjustable for all sizes of motorcycle, ATV, and bicycle chains. Replaceable bristles ensures the Grunge Brush will last a lifetime. Regular component cleaning prevents premature wear and tear on chain and sprockets which assures smooth operation of the drive train.