Injection moulded back with mesh upholstery.Deep upholstered black air mesh.Built in lumbar support.Black 5 start base castors.Pivot style arm rests.Synchronised back and seat tilt with tension control, lockable in upright position.Gaslift seat height adjustment: 440-540mm.Overall H x W x D: 895-995 x 630 x 610mm.Back H x W: 500 x 470mm.Seat W x D: 480 x 500.Suggested max. weight of user: 115kg.self assembly required.