Smooth shifting performance provides confidence to enjoy any trail Light and stiff construction allows faster acceleration and increased chain security HYPERGLIDE+ technology provides better chain engagement, stronger retention, and smoother pedaling Shimano Micro Spline body that features smaller and more widely distributed splines to limit cog damage on freehub Shimano Deore XT CS-M8100 Cassette 12-Speed Micro Spline 10-45T