... Chain:35,40,50,60,80,100,06B,08B,10B,12B,16B The service life of O-Ring Chain is ... the wearing between the pin-shaftand the sleeve. The "O" ring will greatly reduce the wearing and thus prolongthe ... It is most suitable for high-speedrunning.Our brand O-ring chain be recommend the no. 1 in Chinese ... association, berecommend to worldwide.1) Model: 35,40,50,60,80,100,06B,08B,10B,12B,16B2) Color available: ...