Comfortable Chair with Ergonomic Lumbar Support. Internal Frame Material: Glass Filled Nylon Structure with Breathable Mesh | Color: Black | Seat : Molded with 45 density | Size: Medium Back | Swivel: 360º swivel Arms: PP FIXED ARMS | Mechanism : Heavy Duty MULTI Position Lock Synchro Tilt Mechanism | Gas-lift : Class 4 BIFMA (Pneumatic height adjustment) | Base: Glass Filled Nylon Base | Castors: 60mm Nylon wheels Black Maximum Weight Load Capacity :120 kgs. Easy to Assemble. Assembly Required: Chair requires basic self assembly (Just need to connect base with the seat without using any tools) Warranty: 1 year warranty against manufacturing defect's