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The Fixcraft cog is a solid, single speed cog that is shimano compatible, and ready to go on your new Fixcraft Cartridge hub out of the box. It has all the great features you expect from a top end cog; hardened chromoly steel, tall tooth design, non-proprietary, and tough as all hell. The base is 6mm thick and offset to dial in your chainline. The Fixcraft cartridge hub comes with several spacers to futher dial it in as well. Comes in 18t (55 grams), or 20t (67 grams). Both designs tried and true on the courts since 2013.