Special asymmetrical HG-X11 design New Sil-Tec surface treatment The HG901-11 chain ensures a quieter bike with longer life and better performance. Features Compatibility: Shimano Dura Ace, XTR Speed: 11 Mounting type: directional Real weight: 255 g (116 links) Technology Sil-Tec Sil-Tec is a new surface treatment from Shimano for ultra-low friction. It is an advanced plating process that improves system performance, makes it smoother and can be used longer in all conditions. Pin included.