Medical Ergonomic Stool with Chrome Rolling Base (1102) PU Leather cushy feel. Adjustable Height with hydraulic lift and Swivel. Width: 16.5" in Diameter. Height: 20 Inches to 24.4 Inches UPDATED VERSION: customers have told us in the past that the regular wheels do not work well on hard (wood) floors and so we upgraded the wheels to higher quality rubber/plastic so that they will work smoothly on hard (wood) and soft (carpet) floors. We have also added memory foam so it is more comfortable.