Good performance: Ball bearings provide smooth and efficient operation, and the low coefficient of friction allows them to rotate with minimal resistance, reducing energy loss and extending life. High durability: Rubber seals protect bearings, increasing their durability and life. Versatile: These bearings are used in a wide variety of small mechanical applications, including skateboard wheels, in-line skates, and electric motors. Easy to install: The bearings are easy to install and replace, and the operation is simple, saving you valuable time. Date First Available November 13, 2023