These are Herman Miller Classic Aeron chair that have been fully refurbished. These Classic Aeron Chairs have been completely disassembled to be deep cleaned & repainted. Mesh is inspected for minor rips & tears, then replace mesh, if needed. Will have new arm pads, casters, posture fit, head rest & pneumatic cylinders. Which are the most common parts that tend to wear out or not work. Mechanical parts will be greased and lubricated & are all thoroughly tested, and have been confirmed to be mechanically 100 % functional. Forward & backward tilt, posture-fit back support, fully adjustable arms, mesh has like new resistance. And adjustable headrest with removable coat hanger. 
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Backrest will need to installed. Installation video on YouTube will be available, via shared link, upon  request.