1）Headrest: black PU, high-density molded foam, height adjustable. 2）Back: imported PA material, mesh 3）Lumbar support: Black nylon, height adjustable 4）Armrest: adjustable armrest with soft TPU armpad, up&down 5）Cushion: Californian fireproof high-density molded foam, elastic cloth cover 6）Mechanism: 3-lock Mechanism 7）Class 3 gas lift 8）Base: High quality 340mm five star nylon feet 9）Castors: 60mm PU wheel (black)