Features the light weight of an alloy with the protection of a hardened steel shell providing a superior wear surface for longer wheel spacer and bearing life Complete and direct replacement for the OEM parts - Yamaha YZ 250 F (2021, 2020, 2024, 2025, 2019, 2022, 2023); Yamaha YZ 450 F (2022, 2019, 2023, 2020, 2021, 2024, 2025)