SunRace 10 Speed Cassette.

The SunRace MX3 10-Speed 11-42T Cassette is a high performance cassette with wide range gearing compatible with 8,9,10 Shimano/SRAM or 11 speed Shimano mountain bike freehub wheels.This cassette uses a 10 sp chain and shifters

Specifications:
Cassette Body Type: Shimano/SRAM 8, 9, 10 Speed , Shimano Dynasys 11 Speed Mountain
Cassette Cogs: 11-13-15-18-21-24-28-32-36-40
Drivetrain Speeds: 10
Range: 11-40T
Weight: 413 g