The three versions are distinguished by the backrest, while they all have the same seat, mechanisms (Synchro SY24 and PSY6), armrests and base. The Sax 8 backrest is height adjustable, while Sax Rete and Sax Air are height-adjustable and are also fitted with height-adjustable lumbar support. Sax Rete and Sax Air are suggested also in WHITE version (RAL 9010 white colour).