OZ Series comes with top quality genuine leather or with synthetic leather and fabric seating available. The concave back and contoured seat match the natural curves of the human body, combining comfortable ergonomic support with eye-catching contemporary design.These chairs offer a one-touch pneumatic seat height adjustment and locking tilt control with adjustable tilt tension to give you the most comfortable sitting experience possible. comes with top quality genuine leather or with synthetic leather and fabric seating available. The concave back and contoured seat match the natural curves of the human body, combining comfortable ergonomic support with eye-catching contemporary design.These chairs offer a one-touch pneumatic seat height adjustment and locking tilt control with adjustable tilt tension to give you the most comfortable sitting experience possible.