Whitz Racing Products HG-5-9-3 5x9x3mm HyperGlide Ceramic Bearing This bearing is designed to provide superior performance and longevity for high-demand applications. These bearings feature ceramic balls, which are lighter and harder than steel, reducing friction and heat build-up. The HyperGlide series is known for its ultra-smooth operation, providing excellent speed and efficiency for RC vehicles. FEATURES: Increased Drivetrain Roll Lower Friction Cooler Temps ABEC-5 Rating Si3N4 Ceramic Balls Stainless Steel