Oust Moc 5 Street Bearings (Set of 8) Unique bearing design, unlike popular brands, allows for tighter tolerances. High Rockwell material hardness, and high surface polish for increased speed, performance, durability, and low friction. High strength carbon steel ball cage ideal for street skateboarding. Doubled sided non-removable metal shields. Oil hole in shields for easier cleaning and applying oil. Recommend Oust Metol Oil.