From the manufacturer

Ride in different places? If yes, then the PG-1230 is the tool for you. The NX cassette gives you every bit of climbing range that the best of the best will give you at an affordable cost. Using Eagle technology the NX provides an expanded gear range of 520%

Features

• Compatible with a splined driver body.
• This PG-1230 cassette is an integral part of the SRAM Eagle drivetrain Ecosystem.
• Wide 11-50t gear range-a perfect fit for any ride. Optimized gear steps across entire range.