Durability Matter (O-Rings) Consider as the giant step taken in chain industry, RK’s O-ring stands out from the rest with its extra durability. RK Description Durability Matter (O-Rings) Consider as the giant step taken in chain industry, RK’s O-ring stands out from the rest with its extra durability. Lighter Plate (KLO Series Only) Light weight not only give you more speed but reduce your fuel consumption all at once. RK Features Your Brand Honda 10 Your Cyclinder 150 10 Your Model EX5 Dream 10 << return to rK CHAIN