Instruct: Classify Amazon reviews into positive or negative sentiment
Query: extremely cheap quality

I didn't purchase these on Amazon. I bought them directly from the manufacturer about six years ago. Despite being used gently (I don't hammer them into the blank), the metal on these deformed and chipped very badly. They have a whole lot of runout as well. The steel on them seems as if it was never hardened, to be honest. There are much better quality cheap Chinese centers to be found (probably even on this site). I probably should have asked for a refund.