Cercle is a an armchair by Poltrona Frau. Moulded polyurethane foam with a metal insert in a seat and backrest structure. Differentiated-density polyurethane foam for the greater comfort zone and polyester wadding quilt padding. Polished aluminium or aluminium in a black base finish. Soft, self-braking “W” type castors. Covered with leather or saddle-leather. Cercle is a collection of sober, geometrical chairs with a strong scenic presence in the workplace. The “syncron” mechanism is integrated to the shell and additionally optimised to offer high comfort performances. Cercle chair is available in two models, President and Executive, and it is possible to opt for the version completely covered in SC leather or in the double covering in SC leather and Saddle Executive leather. Base: five spokes with column that connects to the casing equipped with gas springs and finish to match the base. Base finishes: Polished aluminium or Aluminium in a black finish Supports: Soft, self-braking “W” type castors or Hard, automatic-braking "W" castors Castor finish: chrome-plated or black FUNCTIONS360° rotationSeat height adjustment“Syncron” movement with adjustment of the inclination angle and the oscillation resistance of the backrest and seat. Removability not possible.