Box One Single-Speed Aluminum Cogs are 7075-T6 aluminum alloy. It’s designed to fit Shimano compatible cassette hubs & has a 5mm wide inner base, giving a more solid interface w/ the cassette body. The alloy cogs are anodized black w/ laser-etched graphics.

FEATURES:

Shimano Compatible Driver
7075-T6 Alloy
3/32″ or 1/8″ Chain Compatible
Lightweight