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Material: Hight quality PVD ZnSe crystal material Diameter:20mm/0.79 inch;Focal Length:50.8mm/2 inch;Thickness:2.2-2.3mm;Transmittance: ≥99.5% Double-sided solid coating,Wiping resistant,Extended durability,Precision slicing polishing and grinding processes,High temperature laser resistance,Excellent optical properties,High working efficiency. It's good for 30W/40W/50W/80W/100W/130W/150W CO2 laser 10600nm 10.6um It can be used for CO2 laser engraving and cutting well., Peso: 0.0440924524 Libras, Fabricante: Shanghai Top Nine Industrial Co.,Ltd