I recently purchased a set of plastic bearings for my machinery from a reputable seller in the Industrial and Scientific category. As a result of my tests I determined that these bearings were not only high quality but also very reasonably priced. They fit perfectly, and MY machine runs smoothly with less noise. The only downside is they may not be suitable for heavy loads, but for my purposes, they work perfectly .Overall, I highly recommend this product to anyone in need of an affordable yet reliable bearing option..