Kogel Bearing 1st-generation ceramic derailleur pulleys may be our introductory pulleys, but they're packed with features that make it a worthy choice for folks wanting a true replacement pulleys on a budget, like full ceramic bearings, exact rear-derailleur sizing, and a colors that help your bike say, "yeah, this is how I ride".
Even better, you can get them at a price that lets you upgrade other drivetrain parts, like perhaps a new ceramic bottom bracket? Just a thought.