The athletic skill level of the person using this product is:intermediate
These are great on long-boards, they are very fast but not very durable, i was skating on my skateboard (enjoi) and i cracked two of them doing a caveman off of a ledge. i recommend these for long-boards and cruiser boards. i have a set of lucky hardballs now and they are pretty good. Overall a good bearing, I've had four sets, but depends of what you are using them for.