Top Quality Black Zento Ergonomic Office Swivel Chairs with Back Lumber Pump. Price is for each Chair. These chairs are sometimes called Zento or Adapt chairs 
These Chairs tick most boxes.. Great maker. Fully Adjustable. Ergonomic 
The chairs have Seat Height. Arm and Back Height  Chair Tlit. Seat Death. Lumber back pump.
The arms can be removed or made wider with quick release. 
The chairs are made for comfort. Posture control.and made to last 
Great chairs at a great price . Condition is good .odd minor marks only on fabric Only to be expected. But for used item ..really Good Condition. Well looked after. Base will have normal scuff and scratch marks.