Comprehensive Compatibility: Designed specifically For Narwal J4/J5 Xiaoyao 001, this kit ensures a perfect fit and function for your robotic vacuum. Time for an Upgrade: Don't let worn or wheels compromise your for Roborock's performance. Our high-quality replacement wheels are specifically designed to replace old, broken, or missing casters, restoring full mobility and enhancing your vacuum's operational efficiency. Simple Installation Process: designed for hassle-free installation without the need for additional tools. The user-friendly design allows for quick and easy replacement, making maintenance a breeze and saving you time Premium Construction: Made with high-grade materials, this part not only promises longevity but also guarantees robust performance under various operating conditions. It's an essential upgrade for anyone looking to maintain their appliance in top condition. Function: Assisted sliding Use environment: Home use Model: For Narwal J4/J5 Xiaoyao 001 Colour: grey Material:plastic Package Contents: 1 x wheel 1 x bracket 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.