General description Set of 4 ball bearings compatible with the wheels of the Polaris 360, 380, and 3900 Sport pool cleaner robot. These stainless steel ball bearings are designed for corrosion resistance and professional manufacturing, ensuring smooth rotation and operation of the wheels. Technical specifications Material: Stainless Steel and Plastic Compatibility: Polaris 360, 380, 3900 Sport, and Vac-Sweep 360, 380 models Installation Easy to install; can be done by yourself Replace damaged bearings to protect your equipment and enhance machine efficiency