Note: Ball bearings are lubricated with imported grease in our factory, please wash thoroughly after contact. Product Features - These elements can be one of the following types: ball, cylindrical, spherical, barrel, needle, spindle, ortapered. All rolling bearings are open, shielded, or sealed. - Sealed bearings are lubricated with oil or grease in the bearing factory, while open and shielded bearings are meant to be lubricated in place, with periodic reapplication of lubrication, based on use. - Theshield protects the working parts of the bearing from environmental debris that may be introduced and could reduce the ball bearing speed and lifespan. - Rolling bearings are used in a range of applications from agricultural machinery to conveying equipment, robotics,dental equipment, elevators, rolling mills, ship rudder shafts, skateboards, inline skates, scooters and aggregate crushers, among others.