Electroplate Conference chair,Negotiation chair: 4legs frame, Premium PP for back,seat and armrest.Polyester cover,50kg/CBM foam . Aluminum Alloy Connector for back, seat and armrest(polish /lacquare),12cm seat,30*30*T1.5 triangle pipe for armrest and seat/back connector.∮50MM, PA Nylon castor has no broken under 50000times resistance and fatigue test.Flip seat,adjustable armrest, stackable.