These are a great upgrade from my Oust moc 5 tec bearings. They were good but I did a rain test with my shark wheels and they rusted out by the time I got a chance to clean out the water. These on the other hand are holding up better speed wise. The only problem was that the set I purchased had a defect in two of the bearings which isn't too much of a big deal, but it was a noticeable difference in a spin test. Overall I recommend these to anyone needing speed on an everyday use.