Customize each Ergofit Office Task Stool to fit your specific needs. Choose from two different height adjustment mechanisms: manual screw lift or pneumatic lift that raises seat with the touch of a lever. Backless stool features 3-1/2" thick seat and 360° ring for pneumatic adjustment. Strong 26" base with powder coat or chrome finish includes 18" dia. footring. Add optional casters for easier mobility. Meets or exceeds ANSI/BIFMA standards. Made in USA.NOTE: Choose the fabric/vinyl and base combination from the colors listed below.Fabric/vinyl color: black, burgundy, grayBase color: black, chromeErgofit Office Task Stools are not available online. Call a Certified Product Specialist to Order.