Materials: 1. Headrest: Heatless Korea Mesh (KM-10) 2. Backrest: Heatless Korea mesh(KM-10) 3. Seat: Heatless Korea mesh(KM-10) 4. Base: Polished aluminum star base. 5. Castor: Black PU castors. 6. Lumbar cushion: Square shape fabric with sponge 7. Lumbar support: Chromed aluminum. 8. Armrest: PU cover Functions: 1. Mechanism: Manual-control Synchronized, multi-angle tilt lock. Backrest tension adjustable. 2. Lumbar cushion: Adjustable(up & down) 3. Seat height: Adjustable(up & down) 4. Armrest: Height adjustable, left and right twistable, forward& backward applicable. 5. Headrest: Angle adjustable. 6. Seat slide: Forward& backward slidable.