Yaheetech High Back Mesh Office Chair Ergonomic Mesh Computer Desk Task Chair Heavy Duty: solid structure with high capacity up to 150kg / 331lb Mobility: contains 5pcs non-marking noise-free castors 360 swiveling: fetch desired file without moving and break space limits Tilt Tension Control Knob: helps self-relax after long time working Height Adjustable: 112-127cm / 44.1-50" total height to meet needs