FEATURESHigh quality office chair rubber caster wheelUniversally fit all office chair bases with mounting holesTwin wheel design enhances weight distribution and soft operation, ease to glide and swivelSwivel and roll freely and more quietly in each route without needing for maintenanceSoft roll rubber wheel surface guaranteed to leave no mark on carpets or any sort of natural and engineered wood floor, tile floor, forte floor, and delicate 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 handbook measurement, please allow an error of 1-2cm.As diverse computer systems exhibit diversified colors, thanks in your understanding, the actual product colour may be slightly assorted from the image.