Bones Swiss Ceramic Bearings - CERAMIC Cleanable - 8 pack Bones Swiss Ceramics are the fastest skateboard bearings you can buy, period. A winning combination of Bones precision ground and polished races, fiber reinforced high speed ball retainer, Cerbec silicon nitride ceramic balls, Speed Cream racing formula lubricant, and a frictionless, non-contact shield. The advantages of using ceramic balls are that they are non-corrosive, lighter weight, harder & stronger than steel, have lower rolling friction, and last longer. This makes Bones Swiss Ceramic bearings accelerate faster, roll farther, and last longer than polished steel ball bearings. If you are looking for the very best, invest in Bones Swiss Ceramics. Comes with 4 bearing spacers. Features - Fastest Speed and Acceleration - Lowest Friction, Longest Roll - Lightest Weight - Self-Mending, Longest Lasting - Pre-Lubricated with Speed Cream - Easy Cleaning & Relubricating - Removable High Speed Nylon Ball Cage - Non-Contact Removable Rubber Shield - Bones Skate Rated Design & Quality - Skate Rated clearances, tolerances, materials and lubricant provide the best performance and durability possible.