High technique requirements O-Ring Roller Chain:35,40,50,60,80,100,06B,08B,10B, ... service life by 5 times. It is especially suitable for the adverse environmentssuch as the one bearing water, mud ... or dust. It is most suitable for high-speedrunning.Our brand O-ring chain be recommend the no. 1 in Chinese ... , Brown, Nickel,Color, Copper3) Packing: Industry packing O-ring Roller Chains for machines