The SunRace M4 7-Speed Cassette is a lightweight cassette that utlizes Super Fluid Drive?äó technology.Features:Lightweight design Features Super Fluid Drive?äó technology ED black sprocket finishSpecifications:Defined Color: Black Color: Black Weight: 311 Cassette Body Type: Shimano/SRAM 8, 9, 10 Speed Cassette Body Type_1: Shimano/SRAM 8, 9, 10 Speed Drivetrain Speeds: 7Cassette Cogs: 12-14-16-18-22-28-34 Range: 12-24