Ultra link fastening systemni ptfe anti vibration treatmentexternal links in special new steelwidth 55 millimetresplease note you will need the new 11 speed chain tool ut cn300 to fit this chainthe 11 speed chain has been designed for shifting more rapidly and fluidly even under stress and to be more resistant than the 10 speed onesilence action the new chorus 11 speed chain is quieter than ever the new 55 millimetre thickness has been combined with the new materials and a special ant