FEATURESHigh quality office chair rubber caster wheelUniversally match all workplace chair bases with mounting holesTwin wheel design complements weight distribution and smooth operation, ease to waft and swivelSwivel and roll freely and more quietly in each course while not having for maintenanceSoft roll rubber wheel floor guaranteed to leave no mark on carpets or any style of pure and engineered wooden floor, tile floor, uniqueness floor, and comfortable concrete/asphalt floorMaterial: PU Rubber and Steel and PlasticWheel diameter: About 50mm (2 inch)Stem Length: About 21mmStem Diameter: About 11mm Grip Ring Type (Look at the picture)Size:As the photographs showPackage Included:1/5PcsNote:Due to guide measurement, please allow an error of 1-2cm.As various computers exhibit different colors, thank you in your understanding, the particular product shade may be barely diversified from the image.