FEATURESHigh high quality office chair rubber caster wheelUniversally match all office chair bases with mounting holesTwin wheel design enhances weight distribution and mushy operation, ease to glide and swivelSwivel and roll freely and more quietly in each route while not having for maintenanceSoft roll rubber wheel floor guaranteed to leave no mark on carpets or any sort of natural and engineered wooden floor, tile floor, specialty floor, and mushy 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 handbook measurement, please allow an error of 1-2cm.As assorted computer systems reveal different colors, thank you for your understanding, the particular product coloration may be barely various from the image.