Super narrow lightweight 11-speed HG-EV symmetrical design chain for smooth shifts & maximum durability. Outer plate design has been developed to reduce the chance of chain suck. Sil-Tec surface treatment technology (PTFE plating) on inner & outer links & rollers that is smooth running & increases durability. Zinc-Alloy plated inner & outer links. The inner plate has been developed for better contact with gears providing smoother shifting under high load, giving efficient pedalling, increased rigidity & near silent running.