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Semi-ceramic high-quality and precise dismountable bearings. 16 pcs in package. Bearings with very low frictional resistance and long service life. Ceramic balls ensure dimensional stability and high accuracy in all applications. Bearing designed for speed skating. Recommended lubrication: one drop of thin oil after cleaning. Enclosure: double-sided, steel-ring reinforced rubber squeegee Cage: plastic Material: Si3N4