Format /B Mediummback chair. Chair entirely upholstered in leather with incorporated armrests. High back- rest is also available with soft headrest version. Height adjustable sliding lumbar support economically shaped and injected polyurethane padding, which is self-extinguishing and CFC free. Synchronized device for seat and backrest adjustable to 5-positions anti shock backrest unlocking device and backrest resistance adjustment according to users weight. 5 spoke base in polished pressure diecast aluminum. Standard dual -tread self - locking swivel castors ø 65 mm.