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6021DDU Ball Bearing
🟢 Closures: Built-in rubber seals
312KD is self lubricated bearing (bearing is already greased)
7909CYU/GLP4 Nachi Ball Bearing
8 Skateboard Ceramic Bearing Si3N4 Sealed Outer Diameter - 450mm 6021DDU Ball BearingS608 2RS Sealed Ball Bearings Stainless Steel Ceramic Balls Si3N4 S608 2RS Ball Bearings are double sealed, radial and deep groove ball bearings,bearings are made from stainless steel with Si3N4 Ceramic (Silicon Nitride) balls,S608 2RS bearing are closed with rubber seals to protect the bearing from dust or any possible contamination. S608 2RS Ball Bearings Deep groove radial ball bearings Material: Stainless Steel Grade 440C Balls: Si3N4 Ceramic