Features:

Adjustable from 17.3 to 22.8 inches, 4" Thick Foam seat, 15" Diameter. Very Nice Stool, most of our staff uses them instead of chairs! Very Easy to Assemble, no tools needed. Perfect for use a professional physician stool.The Seat Back installs very simply without any tools and can be removed very easily. Want a chair, attach the back rest. Want a simple stool, remove the back rest. You can use this product as a chair or a stool.

Specifications:
Back Rest Padding: 1.6" Semi-firm foam system.
Upholstry: Durable PVC vinyl upholstering.
Seat Padding: 4" Semi-firm foam system.
Dynamic Load: 250 lbs distributed load.
Diameter: 15" Diameter Seat.
Height range: 17.3" 22.8".
Net Weight: 14.5 lbs.

Singles.

Pneumatic Stool / Adjustable Rolling Stool with Removable Back Rest