Experience fast and long-lasting performance with the RollerBones Bones Skate Bearings complete with a CCS Skate Tool. This set includes 16 precision-ground skate bearings designed for ease of cleaning and high speed. The removable frictionless rubber shields and high-speed nylon ball cages ensure smooth operation while the bearings are pre-lubricated with low viscosity Bones Speed Cream. The CCS Skate Tool trusted by millions of skaters since 1985 is included for your convenience. With a standard outside diameter of 22 millimeters and a weight of 0.64 pounds these black RollerBones bearings are a reliable choice for skaters. Please note that these bearings are compatible with grease lubricant and are made of rubber material.