For additional durability, the universal casters are covered in racing quality PU combined with heavy ABS plastic. The structure of the chair is the result of 10 years of ergonomic design, including an optimum curve that perfectly supports your spine. If you need to tweak the chair, simply press or pull the handle to raise or lower the chair, press the angle lever and lean back to adjust to 170º, or reposition the adjustable polyurethane armrest. Finished off with computerized embroidery up top and an included headrest and lumbar cushion, the DXRACER FE57 Gaming Chair puts you in the middle of the action and keeps you comfortably there.