The shimano deore xt m8000 11 speed cassette is crafted from the finest aluminium used for its high strength to weight ratio and incredible stiffness the hyperglide sprockets have a computer designed tooth configuration with contoured shift gates resulting in a crisp smooth shift even under load this shimano mtb cassette also features close ratio gearing which allows for more efficient use of energy through finer cadence control and the special design of the sprockets are cut away and drill