Ball Bearings: Compatible with Polaris 180 and 280 cleaners and replace part number C60 C-60 4 Wheel Screws: This wheel screw replaces part number C-55 C55, designed for Polaris 180 and 280 pool cleaner Premium QualityThe ball bearings are made of high quality stainless steel and plastic, which is corrosion resistant. And the screw is made of high quality ABS material, make backup copies of your cleaner in operation every day and works wonderfully Easy to Use: These ball bearings are easy to turn and easy to install and use. And these screws can help solve the problem of damaged pool cleaner wheels or missing parts. Product Description Package Contents: 8 Ball Bearings. Note: This is not a genuine Polaris product. The Polaris brand name and logo are the property of their respective owners. Any use of the Polaris brand name, model, or part designation for this product is made solely for purposes of demonstrating compatibility.