In addition to being a stellar ss cog the cog base width where it contacts the freehub body is 435mm so you can stack a few of them up and use a 9 speed shifter for a simplified multi speed drivetrain this width also prevents it from ruining the freehub body as a result of digging grooves into it like skinny stamped cogs have a tendency to do surly cogs are machined from scm415 cromoly steel then heat treated for toughness and chrome plated for surface hardening and enhanced chain lubric