FEATURESHigh quality workplace chair rubber caster wheelUniversally fit all office chair bases with mounting holesTwin wheel design complements weight distribution and delicate operation, ease to drift and swivelSwivel and roll freely and more quietly in each path without needing for maintenanceSoft roll rubber wheel surface assured to depart no mark on carpets or any type of pure and engineered wooden floor, tile floor, specialty 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 various computers display varied colors, thanks on your understanding, the particular product colour may be slightly various from the image.