HERMAN MILLER Aeron GAMING CHAIR. Brand new and sealed Posted on July 30, 2023 by admin Frame / Base: Black / Onyx. Size: Size B – Medium. Height Range: Standard Range. Back Support: Adjustable Posturefit. Tilt: Tilt Limiter and Seat Angle. Arms: Fully Adjustable Arms. Caster: Multi-Surface Caster with. Brand new, box never opened.