High stability. Important parts (such as headrest, Spring, etc) are improved. With a diameter of over 60 cm; excellent stability. T C28 N. - Ergonomic design – -the chair is ergonomic. This will be a comfortable seat for optimum comfort. - - Thick padding. Allows optimal seat comfort and good elasticity. - SST is not easy to deform. Made of high quality. Cross with 5 wheels is made of nylon or metal, very sturdy and stable. High quality PU or polyester. Pleasant and easy to clean. Multi function – -the chair is 360; rotating. - Tilt mechanism for relaxed resting.