Box One Single-Speed Aluminum Cogs are 7075-T6 aluminum alloy. It's designed to fit Shimano™ compatible cassette hubs and has a 5mm wide inner base, giving a more solid interface with the cassette body. The alloy cogs are anodized black with laser-etched graphics.
- Shimano™ Compatible Driver
- 7075-T6 Alloy
- 3/32" or 1/8" Chain Compatible
It works as it should.