Basic - Pneumatic Lift - Stationary Arms - Standard Tilt - Fixed Seat Depth - 2.5" Black Carpet Casters - Graphite Frame/Graphite Seat Herman Miller Mirra Chair Basic Office Chair Mirra is an innovative blend of passive and active adjustments that provides a new reference point in performance, aesthetics, and value. Mirra automatically shapes itself to each user, while a few simple adjustments fine-tune the fit and feel. The chair's next-generation innovations, including the new upholstered backrest, all work together in a fresh-looking chair that's easy to use. To create the Mirra chair, Herman Miller teamed with Studio 7.5, a German design firm. Basic Model; Color: Graphite on Graphite, Fixed Arms MR221PFMN2G1BBG1BK3Q11 - Basic Model with Fixed Arms Mirra automatically shapes itself to each user, while a few simple adjustments fine-tune the fit and feel.