Shimano XT CS-M8100 12-speed Cassette:

The Shimano CS-M8100 is the suitable cassette for new XT 12-speed group. HYPERGLIDE+ drivetrain’s redesigned cassette and chain promotes the next generation of MTB riding by enhancing speed, shifting efficiency and smoothness over any terrain.

The original mountain bike group continues its legacy: the XT 12-speed cassette CS-M8100 from Shimano:

The original mountain bike group continues its legacy of remaining the standard for mountain bikers everywhere. Nearly three decades in, the DEORE XT brand is defined by its trail-tested durability, reliability and performance. Recognizing that today’s mountain bikers are riding faster and confidently on more technical terrain, the legacy of DEORE XT is more important than ever. In 2019, our pinnacle mountain bike technologies will  trickle down to SHIMANO DEORE XT M8100.