Feature: 1.Every product has a unique Manufacturing Part Number label on the inner package that proves it has been qualified,which include Part Number,Model Number and inspection date information;2.If you have any questions about the item,please provide us the Manufacturing Part Number for checking,your profits will be guaranteed.3.It has fine dot shape and procude quality cutting engraving result.4.ZnSe Focal Lens is commonly used in various optical system.5.ZnSe material, has highly thermal-shock ressistant, making it the best optical material in high-power CO2 system.6.Widely used in processing, engraving machine, marking machine and cutting machine.Specification:Material: ZnseColor: BrownDesign Wavelength: 10.6��mDiameter: 18mm/0.7 inchFocal length: 50.8mm/2 inchEdge Thickness: 2mm/0.07 inchDimension: 18 x 3mm/0.7 x 0.11 inch(Dia x Thick)Weight: 210gPackage Include:10 x ZnSe Focal Lens