As an industrial and scientific buyer, I recently purchased miniature bearings for my skateboard and was amazed by the quality of these bearings. As a result of using this product, I found that my skateboard rides smoothly and the bearings are very durable.The bearings are precisely manufactured and have a nice finish making them easy to install. The only downside is that they are slightly more expensive than other brands, but the added quality makes it worth the investment. Overall, I would highly recommend these bearings for those looking for a reliable and smooth ride..