FEATURES High quality office chair rubber caster wheel Universally fit all office chair bases with mounting holes Twin wheel design enhances weight distribution and smooth operation, ease to glide and swivel Swivel and roll freely and more quietly in every direction with no need for maintenance Soft roll rubber wheel surface guaranteed to leave no mark on carpets or any kind of natural and engineered wood floor, tile floor, specialty floor, and smooth concrete/asphalt floor Material: PU Rubber and Steel and Plastic Wheel diameter: About 50mm (2 inch) Stem Length: About 21mm Stem Diameter: About 11mm Grip Ring Type (Look at the picture) Size:As the pictures show Package Included:1/5Pcs Note: Due to manual measurement, please allow an error of 1-2cm. As different computers display different colors, thank you for your understanding, the actual product color may be slightly different from the image. The merchant warrants that their products comply with all applicable laws, and are offered only if they comply with Joom's policies and EU Product Safety and Compliance laws.