As someone who works in Industrial and Scientific field, I am always on the lookout for reliable and precise bearings. As a result of my tests, I determined that these inch bearing balls are the real deal.The quality is top-notch and I have had no issues with them so far. The only downside was that the quantity was a bit less than I expected but it wasn't a major issue. Overall, I highly recommend these bearings for anyone in need of good quality industrial bearings..