1. Seat & Back: casing high quality high density plywood, graceful and deformation resistant.                                                                                            2. Leg Base: aluminium alloy. 
3. Coating: electostatic powder coating after deoiling, derusting, acid cleaning and phosphorizing.                                                                               4. Sponge: Formed by high density super soft PU cold foaming.
5. Fabric: high grade fabric, anti-staining and unfading.
6. Armrest: high quality oak, polester lacquer painted, with rotary writing table.
7. Seat Mechanism: spring plus damping reversion, no failure, no noise.