Genuine Shimano replacement part Outer plate design has been developed to reduce the chance of chain suck Sil-Tec surface treatment technology (PTFE plating) on inner links that is smooth running and increases durability The inner plate has been developed for better contact with gears providing smoother shifting under high load, giving efficient pedalling, increased rigidity and near silent running 5.62 mm chain width, optimised for 11-speed Super Narrow HG-EV drivetrains Comes complete with Quick Link which enables fast tool free chain assembly Average weight 257 grams .