All stainless steel. Exposing+drying+washout+treatment. 4 in one design very compact. Simple operation, best plate result plates suitable: toyobo cosmolight, toray toreflexetc for printing: label, film, paper, corrugated board, paper carton, knitting bag, tetra pak etc. Exposure + washout + drying +treatment (light finishing) in complete set features of exposure unit instant light up philips high intensity lamps unique digital timers for backmain exposure excellent lamps cooling exhausting system quick vacuum drawdown pump with indicator