Silky driving, accurate shifting. HG-X11 directional chain realizes smoother shifts and greater overall performance. Right and left sides are optimized for front and rear shifting respectively. Shimano 11-speed chain with SIL-TEC surface. Also suitable for e-bike. Sil-Tec, an advanced surface plating technology to increase both performance and durability. It adds a low friction surface treatment that runs smoother and lasts longer. Chain connecting QUICK LINK included.