This is the sram xg1199 11 speed cassette the sram xx1 was built with a dedicated 1x design philosophy making it simpler lighter and more durable than any other no matter where you ride no matter what youre up against sram xx1 unstoppable 11 speeds 10 12 14 16 18 21 24 32 36 42 this cassette is machined from one large piece of hardened steel leading to a high level or precision to the shifting steps it is one piece with no lose parts lock rings or cogs the completely redesigned