Is the base of your Herman Miller Mirra damaged, broken, or no longer in good cosmetic condition? With this Herman Miller Mirra base, you can easily replace the existing frame and make your office chair complete and neat again. The base forms the foundation of the chair. The gas lift/cylinder is inserted into it and the wheels are mounted on it. If the base is damaged, you therefore do not need to purchase an entirely new office chair. By replacing only the base, you can restore your Herman Miller Mirra in a sustainable and cost-effective way and extend the lifespan of the chair.