Alera Brosna Series Mid-Back Task Chair, Supports Up to 250 lb, 18.15" to 21.77 Seat Height, Black Seat/Back, Black BasePneumatic seat height adjustment.Fixed, padded armrests enhance comfort.Some assembly required. WARNING: This product can expose you to Di(2-ethylhexyl)phthalate (DEHP), which is known to the State of California to cause Cancer and Birth Defect/Reproductive Harm. For more information go to www.P65Warnings.ca.gov. - Cancer:Di(2-ethylhexyl)phthalate (DEHP);;Birth Defect/Reproductive Harm:Di(2-ethylhexyl)phthalate (DEHP)