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Material: Hight class CVD Znse material (US II-VI) Focal Length:63.5mm/2.5" ; Dia:12mm/18mm/19mm/20mm/25mm/28mm/30mm optional; Thickness:2.2-2.3mm; Double-sided solid Coating;Resistance to wipe;High transmittance; Long service life It's good for 40W,50W,60W ,80W,100W,130W,150W,180W,200W,max 400W CO2 laser 10600nm 10.6um. It can be used for CO2 laser engraving and cutting well.