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 The CS-M7100 cassette meets durability requirements for E-MTB applications Shimano SLX CS-M7100 Cassette 12 Speed Micro Spline 10-51