These are bone stock OEM replacement parts right off the boat from Italy. If your performing standard maintenance and replacing pulley wheels on your Campagnolo rear derailleur, this is what you want to use. Go right to the source and accept no aftermarket imitations. Set in includes upper and lower wheels, bushings and covers.
Make sure you choose the correct set to match your derailleur. Different speed drivetrain derailleurs require the correct pulley wheel set to function properly.