Chair with trestle swivel base, in chromed, brushed or painted stainless steel. The shell is available in single-color and bi-color polypropylene (ColorBi®), standard or inverted; polypropylene with front-face upholstery in leather, faux leather, fabric or customer’s fabric; upholstered in two grades of hard leather; fully upholstered in leather, faux leather, fabric or customer’s fabric; wood, in three color finishes (natural oak, bleached oak, wengé) or double-curved wood in three finishes with front-face upholstery in leather, faux leather, fabric or customer’s fabric. Optional steel armrests, also with polypropylene or upholstered support, are available upon request.