Since October 10, 2020, we have thickened the stool seat (3"to 4"), which is a very rare thickness, and we guarantee that it will give you a very comfortable experience. "Use good materials to assemble an excellent stool" 1.Stool seat with perfect details Unlike those rough-made stool chair, our rolling stool are still covered with leather even on the back of the stool seat, which will be more beautiful and extend the service life. The stool chair cushion is very comfortable and soft.Seat Diameter:14.2". 2.Excellent hydraulic system Designed for multi-scene work:The adjustable range of the hydraulic stool is 22"-29". This high stool is suitable for medical, sewing room, salon, office, classroom, etc. 3.Sturdy aluminum base The reinforced 21" aluminum base is very sturdy and not as easily damaged as plastic materials. Weight capacity:400 lbs. 4.High-quality office wheels From one room to another, these polyethylene wheels do not make any noise, very smooth, and safe for all floor. 5.Easy to assemble The package comes with instructions, no tools are needed, you can assemble this stool on wheels in 3 minutes. Please contact us directly through Amazon "Contact Seller", and you will get a response within 24 hours.