Pair Of 18307 2RS Bearing 18x30x7mm Rubber Sealed Cartridge Chrome/Ceramic 69032

18307 2RS Bearings. OEM spec 2RS bearings. Each Hybrid Ceramic 2RS. Single Ceramic. bearing contains. bearing balls in case. silicone nitride ( ceramic Si3N4 ). Bearings should never be installed by pressing on the inner race or rubber seal.