With this XTR M9100 12 speed Shimano offer its most advanced cassette. To build it Shimano has developped a brand new technology named Hyperglide+ that provides faster, quieter and smother shifts while pedaling. The brand has carefully selected materials to provide the better weight to resistance ratio so small sprockets are in steel, centrals are in titanium and 3 bigs are in aluminium. To install this M9100 cassette on your wheel they also designed a new aluminium driver body named Micro Spline that's more resistance but not many brands have licensed this freehub for now.
Features
Material 10 to 16T sprockets: Steel
Material 18 to 32 or 18 to 33T sprockets: Titanium
Material 36 to 45 or 39 to 51T sprockets: Aluminium