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.
7075-T6 Aluminum Offers Lowest Possible Weight 5mm Wide Inner Base to Give More Solid Interface with Freehub Body
