About this item 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: Comfortable elegant arms design | Mechanism : Heavy Duty Single Lock Synchro Tilt Mechanism | Gas-lift : Class 4 (Pneumatic height adjustment, BIFMA Certified) | Base: Glass Filled Nylon Base | Castors: 50mm Nylon wheels Black. Maximum Weight Load Capacity :120 kgs. Easy to Assemble. Assembly Required: Chair requires basic self assembly