The EAI Gold Medal cog goes one step further than the EAI Super Star cog. This is why national track teams from all over the world are buying the Gold Medal cog from EAI, and you may even see the best track racers in the world riding this cog in the 2008 Olympics in Beijing, China . The cog is polished; the teeth are refined (by machine), and some hand finishing is done to ensure all is perfect. Then, the Gold Medal cog is coated with titanium nitride (TiN). This TiN coating, which gives the cog its lovely gold color, is used in Formula 1 race car transmissions. The TiN coating is so tough, it doubles the life of the cog and markedly reduces chain friction. (Yes, doubles the life of the cog.) The well-engineered tooth-shape of the cog is designed to be run with a high-quality 1/8th-inch track chain.