Legendary Original Bones&reg; Swiss Bearings are the optimum combination of Bones Skate Rated&trade; design and Swiss precision manufacturing creating the standard by which all other bearings are measured. For more than 24 years preferred by the world's top professional skaters. Proven, professional competition-grade speed and durability make Bones Swiss normally last several times as long as ordinary ABEC rated bearings. Features  Single, removable, non-contact rubber shield allows easy cleaning and low friction. High speed Nylon&reg; ball retainer provides added strength and speed. Pre-lubricated with Speed Cream&trade; racing lubricant. Skate Rated&trade; clearances, tolerances, materials and lubricant provide the best performance and durability possible. Best selling high end skate bearing in the U.S.A.  Contents  Set of 8 bearings