Features:Features grade 5, silicone nitride, hot isostatically pressed ceramic balls.Higher quality steel races and a superior surface finish.Single non-contact removable rubber shield 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.
