Shimano's not-so-new asymmetrical design finds its way to an XT level to make any XT 10 speed drivetrain shift with perfection. One way design improves up shifts by virtue of asymmetrical shaping. It allows the chain to travel smoothly up and down the cassette and front chainrings.
Special plating and reinforced links help the chain resist wear and premature stretching. Easy to install and will work on XTR 10 speed drivetrains as well, but not compatible with 10 speed road systems.