United StatesCOM List Price: $1440 COL List Price: $1670 Chair Control - Knee-tilt mechanism with pneumatic height adjustment standard. Base - Five arm aluminum base; available in black powdercoat or polished aluminum. Metal Finishes -exposed metal arm and back accents' finishes: black or silver powdercoat. Model 971 woven - adjustable headrest optional (RS-4999 ebony standard). Optional soft casters.