Steelcase Amia Task Chair: Platinum Frame/Base - 4 Way Adjustable Arms - Standard Carpet Casters Buzz2 Made in USA Features back tension adjustment knob, height-adjustable LiveLumbar support, seat slider, and 4-way adjustable arms Keeps your body aligned to your work throughout the day as you recline and switch postures Back includes a system of flexors for continuous lower back support as you move throughout the day Weight tested and warranted up to 300 lbs. with no loss of performance 12 Year Steelcase Warranty