Turnstone Buoy Stool: Black Base - Tornado Buzz2 Upholstery Fabric Made in USA 18 diameter upholstered cap Built-in handle  used to adjust height and easier to carry Plastic canister  easy cleaning and maintenance of the Buoy base Pnuematic cylinder height adujstment  5 1/2 range to fit all sizes 12 Year Steelcase Warranty