ERGONOMIC POLYURETHANE CHAIR - BLACK - A203TM THE CONTOURED SEAT AND BACK OF THIS ADJUSTABLE OFFICE CHAIR PROVIDES COMFORTABLE SUPPORT. THIS ERGONOMIC DESK CHAIR FEATURES PUNCTURE AND TEAR BLACK POLYURETHANE FOAM WITH A TOUGH OUTER SELF SKIN THATS MAINTENANCE FREE IN TOUGH ENVIRONMENTS. ADJUSTMENTS OF THIS ERGONOMIC CHAIR FEATURES INDEPENDENT SEAT AND BACK TILT ANGLE ADJUSTMENT THAT ALLOW PERSONALIZED POSITIONING. BACKREST FEATURES 32-1/2"" TO 37-1/2""H AND 2""D ADJUSTMENTS. 16"" TO 21"" PNEUMATIC SEAT HEIGHT ADJUST. SEAT 18-1/2""W X 18""D X 2"" BACK 16-1/2""W X 13""H. STRONG 5 BLADE BASE INCLUDES BOTH CASTERS FOR MOBILE USE AND GLIDES FOR STATIONARY USE.