This is a set of 608 type bearings primarily used for skateboards, inline roller skates, kickboards, kick scooters, J-Boards, and Brave Boards. The grade is the highest quality ABEC-11, so the rotation lasts incredibly long. This is a product we highly recommend you try. We check the rotation of each bearing individually, but there may be minor scratches. These do not affect use, but we appreciate your understanding before considering a purchase.