- Sonic Speed 608 Bearings will help you skate your best on the streets, at the rink, or anywhere in between. Smart design and uncompromising quality creates performance and reliability you can trust. Speed 608 Bearings feature precision honed races and balls for ultimate acceleration and glide speed. The chrome steel races are able to withstand the lateral stresses skate bearings have to endure, and a lightweight nylon retainer keeps the balls spinning longer and quieter when compared to steel retainers. A labyrinth seal helps defend against intruding dirt and debris, but the bearings remain fully serviceable through a removable non-contact shield. Each bearing has one green and one blue shield so you can easily track wheel rotations, and the container even doubles as a small skate parts organizer so there's no waste!