Product Info Wide range and close step 12-speed XT M8100 cassette 10T lowest sprocket realized by new Micro Spline freehub body construction Two largest sprockets made from aluminum, to further reduce weight Beam Spider construction results in a lighter and stiffer cassette Hyperglide+: enhanced shifting speed and efficiency allows to pedal continuously while shifting up or down Better chain engagement and stronger retention for improved confidence over any terrain Weight: 470g