FEATURESHigh quality workplace chair rubber caster wheelUniversally match all workplace chair bases with mounting holesTwin wheel design enhances weight distribution and gentle operation, ease to go with the flow and swivelSwivel and roll freely and extra quietly in every direction without needing for maintenanceSoft roll rubber wheel surface guaranteed to depart no mark on carpets or any style of pure and engineered wood floor, tile floor, strong point floor, and mushy 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 on the picture)Size:As the pictures showPackage Included:1/5PcsNote:Due to manual measurement, please allow an error of 1-2cm.As varied computer systems exhibit assorted colors, thanks for your understanding, the actual product shade could also be barely varied from the image.