AKRacing Office Series Obsidian. Seat type: Upholstered padded seat, Backrest type: Padded backrest, Seat colour: Black. Height (min): 13.1 cm, Height (max): 13.7 cm, Seat height (min): 3.55 cm The Obsidian chair is the true pioneer of the AKRacing Office chair series. With executive looks and top-quality materials, it is the right choice for your office – be that a corporate setting or a home office. Upholstery in Carbon Fiber PU leather or Softouch™ Suede makes it a sleek choice for any setup. Adjustable seat and backrest, premium cold-cured foam cushioning, 4D armrests, and headrest/lumbar support pillows offer comfort and support for the long hours of work. You can even stay up late for the overtime, taking advantage of the 180-degree recline function!