Skateboard bearings are made of high-quality carbon steel, with smooth surface, fast speed and low noise, which can keep your skateboard running smoothly and at high speed, so that you can concentrate on improving skateboard technology without any worries. Each shield bearing has two low friction rubber seals, which can contain lubricant and effectively prevent the invasion of external foreign matters, protect the bearing and extend the service life of the bearing. Bearings under the ABEC system are generally called precision bearings, numbered from 1 to 9. The higher the number, the higher the precision level used in bearing manufacturing, the higher the ABEC level, the better the quality. The friction force of bones bearings is small enough to be ignored. It has high speed and fast heat dissipation. When used with mechanical installation, it greatly improves the operation efficiency of the machine and is durable and reliable. Universal bearings are widely used in toys, skateboards, roller skates, childrens scooters, sports equipment, doors and windows, machine tools, papermaking machinery, motors, robotics, wind turbines, etc.