Features: Premium caster wheel keeps your home robot operating at . 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 inch Name: Vacuum cleaner caster Colour: black + white material: plastic Quantity: 1pcs Package Contents: 1pcs Universal casters Only the above package content, other products are not included. Note: Light reflection 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.