FEATURESHigh high quality workplace chair rubber caster wheelUniversally fit all workplace chair bases with mounting holesTwin wheel design complements weight distribution and comfortable operation, ease to flow and swivelSwivel and roll freely and extra quietly in every direction with no need for maintenanceSoft roll rubber wheel floor guaranteed to leave no mark on carpets or any form of pure and engineered wood floor, tile floor, uniqueness floor, and soft 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 images showPackage Included:1/5PcsNote:Due to handbook measurement, please enable an error of 1-2cm.As different computer systems reveal varied colors, thank you on your understanding, the actual product coloration could also be barely various from the image.