FEATURESHigh quality office chair rubber caster wheelUniversally match all office chair bases with mounting holesTwin wheel design complements weight distribution and comfortable operation, ease to drift and swivelSwivel and roll freely and extra quietly in each direction without needing for maintenanceSoft roll rubber wheel floor assured to go away no mark on carpets or any style of natural and engineered wooden floor, tile floor, forte 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 images showPackage Included:1/5PcsNote:Due to guide measurement, please enable an error of 1-2cm.As diversified computers display diverse colors, thank you on your understanding, the particular product color may be barely different from the image.