The knobs look great and were really easy to install. A few of them had minor discoloration from what appeared to be just dirt that was stuck to them and tarnished them. I washed off the chunks of dirt but the discoloration remained. I just put those knobs on my lower cabinets with the discoloration pointing down. The only way anyone will ever see it is if they lay on my kitchen floor and look up at the knobs, so I'm not worried about it. Out of 23 total knobs, three had this problem. Overall I'm still quite pleased with them and they look great.