Backrest, Ht. Physicians stools are a very important feature in any medical facility.3 different base configurations:Black CompositeBright ChromeAluminum Base with Toe Caps2 different pneumatic height adjustmentsStandard: 17â³-22â³Medium: 19â³-26â³High: 23â³-32â³2 Backrest options:Upholstered BackrestCrescent BackrestWeight capacity 300 lbs.