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Euro-Asia Imports brand cogs will last through several years of heavy use without worry. Machined, hardened-steel! Made in the USA!
You don't really need that EAI gold cog. This one does it's job just fine. Paired with a 710 sl Kool chain, it gives a quiet drivetrain.
one of the best track cog i ever own.very durable and wont give you any problem.