eurosports Office Chair ES-8009-BK Ergonomic PU Nylon Base Medium Mesh Back Chair,Black Strong 5 castor-wheel chrome base lead 360 degree swivel Comfortable chair ,ergonomically designed for comfort for those who work at desks for long periods Computer chair with thick padding for superior comfort Pneumatic seat-height adjustment for easy positioning one touch pneumatic seat height adjustment, heavy duty nylon base with dual wheel carpet casters