I bought these for use in 3D printed components. Many reviewers commented that they don't spin freely and some felt rough to the touch. Bearings are designed to carry loads and allow for smooth rotation, and they are excellent at that. I use them for 3D printed projects and so far have not been disappointed. For skating I would recommend spending more and getting a set of quality skate bearings - I have a set of quality skate bearings that I've been skating since 2012 (8). years already). You will feel poor quality with every reel, I wouldn't expect them to last as long or be as fast and smooth as branded bearings but they are significantly cheaper and almost disposable but still offer a relatively smooth reel compared to plastic on plastic prevents premature wear on my models.
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