Perfect Compatibility: Designed specifically for the S50, S51, S52, and S55 models, these replacement wheels a and seamless operation of your robotic vacuum. Construction: Crafted from materials, these travel modules are built to withstand regular use, helping your robot navigate smoothly across various surfaces. Easy Installation: Replace your old or wheels quickly and easily with our user-friendly design, ensuring for your returns to without professional help. Enhance Performance: Improve your sweeping robot's efficiency and maneuverability with these precisely engineered modules, reducing maintenance time and extending the lifespan of your appliance. Specifications: B:left wheel Color:As Shown Material:Plastic Package Contents: 1 * for Replacement Wheels 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.