Bones Swiss Precision skateboard bearings are the original Swiss made bearings loved the world over. For more than 34 years Bones Swiss bearings have been the go to bearing world's top professional skaters. The highest grade manufacturing process gives proven, professional competition-grade speed and the resulting durability makes them last many times longer than ordinary ABEC rated skateboard bearings. * A single, removable, non-contact rubber shield allows easy cleaning and low friction. * A high-speed nylon ball retainer provides added strength and speed. * Pre-lubricated with Speed Cream& racing lubricant * Skate Rated; clearances, tolerances, materials and lubricant provide the best performance and durability possible. * Best selling high-end skate bearing in the U.S.A.