Black Panthers ABEC 3: Genuine 100% Teflon oil doesn't break down, so it lasts longer than other inferior, lubricants; Rubber coated removable shield bearings will last longer with better performance, because they can be opened and cleaned, and the rubber coating allows for easier removal as well as making them more water resistant; Delrin core adds High Tensile strength, impact resistance and stiffness, outstanding fatigue endurance, excellent resistance to moisture, has excellent dimensional stability, and is actually self lubricating; Speed washers ensure that the bearing will be able to spin freely, without rubbing the truck or the axle nut; Bearing spacers protect bearings and wheels; Polished ball bearings and races for a smooth ride that lasts.