Product DescriptionThese cogs are made from 7075-t6 aluminum. They have a 5mm base to keep from damaging the splines on your freehub body. The teeth are central to the base, so you can flip it around to double the life without screwing up your chain line. These are aluminum, and will obviously wear faster than ti or stainless, so they're best left for racing or the ultimate weight weenies.
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