Box One Single Speed Aluminum Cogs
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.
The product finish and fit appeared high quality when it arrived. Unfortunately, 4 of the teeth sheared off after 2-3 months of riding.
It works as it should.