SRAM PG-1170 11 Speed Cassette 11-28
SRAM 10 and 11 speed cassettes with 11 tooth cogs have the smallest cog located behind the cassette in the packaging
Aluminum alloy lockring
Cassette Cogs: 11-12-13-14-15-16-17-19-22-25-28
Range: 11-28
Drivetrain Speeds: 11