BALL BEARING WITHOUT LUBRICANTOIL

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A silicon nitride ceramic material the device a signal with the same wavelength component herein magnesium oxide (MgO) or yttrium (Y 2 O 3) of rare earth metal oxide sintered firing a superior abrasion resistance of silicon nitride kick, for gim neutral, non-oxidizing (corrosion resistance) heat resistance and without using lubricant using is provided to ball.