Laboratory high back stools. These are metal framed stools with wood seats and metal back rests. They have an adjustable seat height of 44 cms to 67 cms. There is a foot rest ring at the base when the seat is in a lower position. They have a clever mechanism for raising/lowering the seat. You pull it UP to the height you want. To Lower it you pull it ALL THE WAY up and it automatically descends. Simple and elegant! Most of them still have the instructions below the seat and the University Sticker.