Bones Super Swiss 6 bearings. This unique design features six larger diameter balls instead of the seven balls used in most 608 bearings. The advantage of this design is higher speed, faster acceleration, greater strength and durability. Single, non-contact, removable rubber shield allows for easy cleaning and less friction. High speed nylon ball retainer for greater strength and speed. Pre-lubricated with Speed Cream racing lubricant. Skate Rated clearances, tolerances, materials and lubricant provide the best performance and durability possible.