- CNC-machined from long-wearing 7075-T6 aluminum alloy
- Designed to fit Shimano-compatible cassette hubs and have a 5mm wide inner base, giving a more solid interface with the cassette body
- Alloy cogs are anodized black with laser-etched graphics
- COG BOX ONE ALY 13T 3/32 f/SGLE SPD CASS BK
Material: 13T
Color: Black