-Std. Physicians stools are a very important feature in any medical facility. Backrest, Ht.3 different base configurations:Black CompositeBright ChromeAluminum Base with Toe Caps2 different pneumatic height adjustmentsStandard: 19″-24″High: 23″-32″2 Backrest options:B-Upholstered BackrestCB-Crescent BackrestWeight capacity 300 lbs.