POLISPORT Kettinggeleider zwart Kawasaki KX250F KX450F It offers a better durability It offers a better durability and fits on two parts to avoid the chain removing during maintenance This helps to reduce surface wear and lessens the amount of dirt entering the hub which in turn extends the life of the bearing All the plastic parts are manufactured with the DGP (Durable gloss Polypropylene) which provides them high level resistance and gloss finish Same as used in MXGP