Genuine OEM Herman Miller Aeron Classic arm yoke assembly from the fully adjustable thumbwheel (“wheel style”) arm system. Compatible with Aeron Classic chairs in Sizes A, B, and C when matched to the correct side and configuration. Graphite / grey color. Shows normal signs of previous use including light cosmetic wear from office use. Fully functional and ready for installation. Please review photos carefully to confirm compatibility with your chair before purchasing. Designed for Aeron Classic models and not the newer Aeron Remastered version.