20pcs/lot 2.381/2.5/2.778/3.0/3.175/3.5mm ceramic balls Silicon Nitride balls for bearing/pump/linear slider/valvs balls/bike G5

20pcs/lot 2.381/2.5/2.778/3.0/3.175/3.5mm ceramic balls Silicon Nitride balls for bearing/pump/linear slider/valvs balls/bike G5

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