BATTERY-SAVING - By swapping out the front caster wheel every few months, it prevents dust & grime from building up and jamming the wheel decreasing its ability to roll efficientlyKEEP YOUR HOUSE SPOTLESS CLEAN By regularly replacing the wheel on your robot vacuum cleaner you can expect to enjoy excellent surface-cleaning results all the time.HIGH-QUALITY MATERIALS - Not sure if these wheels will withstand daily wear and tear? All the components in this front caster wheel are made of high-quality material.Package Contents:1 * Left Wheel1 * Right WheelWelcome to my shop:Our products are of high quality, if you have any questions, please contact us in time, we will help you solve the problem as soon as possible, with many years of store management experience, you can contact our customer service team if you have any questions, I hope you have a good shopping experience.Happy shopping and life!