Ceramic diff balls are awesome as they last forever but I wouldn't recommend them to anyone that is relatively new to ball diffs as they have a very narrow window of adjustment and are very hard to set correctly. Definitely for the more experienced diff builder. It took me three times of wasting a lot of money on the ceramic balls before I finally figured out of set them correctly. Just a word of advice. Wild cherry is correct in that they are way better than the stock carbide balls though, the ball diff I have in my car is the same diff I've had in it since early June and it feels exactly the same as the day I built it.