The Iodine SL Directset's outer races are formed from awsome 440c stainless steel this finish will looking great for years.  Don't be fooled by the awsome looks, it also features custom made 28 ball sealed retainer bearings on top and 34 ball max bearings on the bottom. This combination saves weight where you can the top race takes less punishment, but makes it tough where you need it, with a full complement of bearings for the bottom race. Crank Brothers made this headset for all mountain bikes running a 1 1/8 inch headtube.