All Balls Wheel Spacers - Extend bearing life with All Balls aluminum and steel replacement spacers, designed for years of service even in the dirtiest riding environments. aluminum spacers feature a hardened steel sleeve pressed over an anodized Aluminum body to provide a superior wear surface, yet retain the light weight of Aluminum. Steel spacers are hardened and plated to provide years of service and also feature a retention lip so they wont fall out of the seals.