This Rotrex pulley is made of steel and is the original design and mounts with the single center bolt.
It is 8 rib.
Fits the Rotrex C30 and C38 superchargers. Will not fit C38R Rotrex superchargers or supercharger that came from the factory with the new style pulley flange.
These are very limited in quantity and will not longer be produced or stocked.