This is an ultra lightweight crank pulley, plus power steering and alternator pulleys for the Subaru Impreza 04-08 All Models.

The crank pulley is modified from the original design to turn only the power steering and alternator belt. The 4 groves for the A/C belt have been replaced with 5 grooves. 

The crank pulley is now ultra lightweight, but to use this pulley the power steering and alternator must be remounted to line up correctly.