IAFA: Black Zillion High Back Ergonomic Office Chair with 3D Adjustable Arms,Multi  Syncro Tilt, Heavy Duty Metal Base, Adjustable Lumber Support, and Adjustable Headrest. Take care of your body while you work. The IAFA - Black Zillion High Back Ergonomic Office Chair features adjustable arms, multi-lock synchro tilt, a heavy-duty metal base, adjustable lumbar support, and an adjustable headrest.