It's a copper or aluminium or POM being produced through special workmanship, on which the high quality rollers are arranged orderly in certain Angle and density.
该产品以铜基、铝基或POM为基体，配以优质钢球，按一定的角度和密度有序地排列，采用特殊工艺加工而成。
It's a copper or aluminium or POM being produced through special workmanship, on which the high quality rollers are arranged orderly in certain Angle and density.
该产品以铜基、铝基或POM为基体，配以优质钢球，按一定的角度和密度有序地排列，采用特殊工艺加工而成。
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