Profile Titanium Casette Driver
• Manufactured at Profile Racing's U.S.A. plant using aerospace grade titanium (lighter than chromoly). These CNC machined cassette drivers fit all of Profile Racings cassette hubs and accept Profile Racing cogs sizes 12T to 18T.
• Pawls & springs not included. (sold only as a set - 4 springs and 4 pawls). Note: if you are switching from a Profile Racing 9-10-11T cog/driver you will not need the springs & pawls. You will be able to transfer them from one driver to the other.
• It is important to also replace your chain whenever you install a new driver or cog. A worn, stretched chain will cause your driver or cog to wear out much faster."