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

Material: 7075-T6 Aluminum
Process: CNC-Machined
Finish: Two-Toned & Solid Anodized w/Laser-Etched Graphics
Size: 13T, 14T, 15T, 16T, 17T, 18T
Compatibility:
• Driver: HG Freehub Body
• Chain: 3/32” or ⅛”