Sram XG-1199 11-speed 10-42T cassette.

SRAM XX1 was developed with a special 1X drivetrain philosophy, making it simpler, lighter and more durable than any other drivetrain. No matter where you're riding and what's in your way.

The first of its kind
With 10-42 teeth, the 11-speed X-DOME? cassette offers an incredible range of ratios while still maintaining optimal gradations. In combination with the XD? Freewheel it is perfectly connected to the wheel.
The X-DOME technology creates an incredibly light, precise and strong cassette. The open design is less susceptible to dirt, ensures cleaner shifting and longer durability. XD DRIVER BODY. XD? is a new freewheel design that allows the use of a 10-tooth ring and provides an improved coupling surface with the cassette.

Features:
Cassette Gradation: 10-12-14-16-18-21-24-28-32-36-42
Suitable for shifting: SRAM 11-speed

Weight: approx. 260 grams