This product is a set of 6mm bearing spacers designed for inline skates, and it comes in a pack of 8. Bearing spacers are essential components that fit between the bearings on the axles of inline skates. They help to ensure proper alignment and spacing of the bearings, which can improve the overall performance and durability of the skates. This set of bearing spacers is ideal for those looking to maintain or upgrade their inline skates for a smoother and more efficient skating experience.