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.

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

SPECIFICATIONS
- Material: 7075-T6 Aluminum
- Process: Laser-etched logos

Weight
- 13t: 8 grams / 0.3 ounces
- 14t: 11 grams / 0.4 ounces
- 15t: 13 grams / 0.5 ounces
- 16t: 14 grams / 0.8 ounces
- 17t: 16 grams / 0.6 ounces
- 18t: 18 grams / 0.65 ounces