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This sealed inline/rollerblade skate bearing has deep groove geometry for high speeds and supporting both radial and axial loads. This bearing is made of chrome steel for durability and resistance to deformity under heavy loads, and it has non-contact seals that fasten to the outer ring on both sides of the bearing to keep lubricant in and contaminants out. The zirconium oxide ceramic bearing balls provide low friction, high hardness, density, and shock tolerance, and resistance to chemicals, heat, and fracturing. It has a nylon cage that evenly spaces the balls for even load distribution and prevents contact to reduce friction, vibrations, and noise. This sealed ball bearing is for use in inline/Rollerblade skates.What’s in the Box16 inline/rollerblade skate bearingsRolling bearings use rolling elements to maintain the separation between moving parts to reduce rotational friction and support radial and axial loads. These elements can be one of the following types: ball, cylindrical, spherical, barrel, needle, spindle, or tapered. 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. The shield 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, and aggregate crushers, among others.