1. Plastic casing: formed by one time HD polypropylene extrusion.                         
2. Leg Base: hydraulically formed by high quality 3mm cold-rolled steel plate.
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: formed by PP+ABS extrusion.
7. Seat Mechanism: spring plus damping reversion mechanism, no failure, no noise.