Master Massage Ergonomic Swivel Saddle Rolling Hydraulic Stool in Black for clinic,spas,salons,debtists,classrooms,home,office Saddle seat design for more comfort and support to the spine by reducing painful pressure on the back. 2.5" exclusive Molded foam is specially molded around the seat base, not glued. The chair will last years without looking worn. The soft polyurethane wheels make the stool safe for hardwood flooring. The hypoallergenic, CFC-free, oil and waterproof upholstery is backed by a 5 year guarantee. Adjustable height of 20.5" to 27.5"; Weighs 11lbs but supports 550lbs.