FEATURESHigh high quality office chair rubber caster wheelUniversally fit all office chair bases with mounting holesTwin wheel design enhances weight distribution and tender operation, ease to glide and swivelSwivel and roll freely and more quietly in each path with no need for maintenanceSoft roll rubber wheel surface guaranteed to go away no mark on carpets or any form of pure and engineered wooden floor, tile floor, specialty floor, and tender 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 manual measurement, please enable an error of 1-2cm.As different computers exhibit different colors, thank you to your understanding, the particular product colour may be barely diversified from the image.