Top of the range Dura-Ace Super narrow lightweight 10-speed directional chain for optimum cassette and chainset interaction and maximum power transferChain uses a directional design with specifically shaped inner and outer plates to optimise shifting over the chainset and cassetteOuter plate design has been developed to reduce the chance of chain suckThe inner plate has been developed for better contact with gears providing smoother shifting under high load, giving efficient pedalling, increased rigidity, and near silent runningHollow link pins and perforated inner link plates offer great weight savingsHyperglide (HG) series 10-speed compatible chainDurability is assured through a chromising treatment on link pins, and the heat treatment of rollers, pins, and plates5.88 mm chain width, optimised for 10-speed Super Narrow HG drivetrainsZinc-alloy silver finish offers the longest lasting and best resistance to corrosion252 grams