Features:Premium caster wheel keeps your home robot operating at performance.Easy to install and replace the old, broken, loose, worn or missing front wheel casters.Recommended that the front caster wheel is regularly cleaned.Every one or two months depend on your cleaner usage.Wheel only, other accessories demo in the picture are not included!Specification:Type: Accessories Dimension: 48x48x55mm/ 1.89x1.89x2.17 inchName: Vacuum cleaner casterColour: Blackmaterial: plasticQuantity: 1pcsPackage Contents: 1pcs Universal castersOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.