Herman Miller Mirra Chair Basic Home Office Desk Task Chair Graphite Frame Citron Triflex Seat Back Fixed Arms plus Standard Casters Genuine Herman Miller 12 Year Factory Warranty is INCLUDED! Genuine Herman Miller Mirra Basic Chair - Fixed Arms, no tilt limiter, no seat angle adjustment with a fixed lumbar support. Mirra is an innovative blend of passive and active adjustments that provides a new reference point in performance, aesthetics, and value. The 12-Year Warranty covers everything that makes a Herman Miller Office Chair--including casters, tilts, pneumatic cylinders, and all moving mechanisms.