Industrial and Scientific products need to be reliable and efficient .Based on my observations these bearings do not disappoint the user. They come in good packaging and were delivered fast. These bearings are perfect for my woodworking machines. They provide smooth performance and reduce wear and tear on the machines. The only downside is that they may not be the most affordable option, but you get what you pay for. Overall, I recommend these bearing balls for anyone in need of high-quality power transmission products..