FEATURESHigh high quality office chair rubber caster wheelUniversally fit all office chair bases with mounting holesTwin wheel design complements weight distribution and soft operation, ease to float and swivelSwivel and roll freely and extra quietly in each route without having for maintenanceSoft roll rubber wheel surface guaranteed to leave no mark on carpets or any variety of natural and engineered wooden floor, tile floor, strong point floor, and smooth 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 allow an error of 1-2cm.As diverse computer systems reveal different colors, thank you for your understanding, the actual product colour could also be slightly various from the image.