Backrest: High backrest, with polished chromed steel structure covered by fine black mesh fabric for the 520R model, grey mesh fabric for the 540R model; covered backrest for the 520 model; with adjustable lumbar support; internal adjustable lumbar support for the 522 model.
Seat: Reinforced rigid internal polypropylene core and external plastic cover; cold formed polyurethane padding.
Adjustments: synchronized mechanism for the 520R and 520 models, permanent contact, seat gas adjustement for the 522 model.
Armrests: fixed nylon black with soft pad; optional: adjustable black and grey armrests in five positions of height.
Base: swivel five star structure in black and grey nylon with black and grey castors; as optional: 5 star in polished aluminium with chrome castors.