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Size:FL 38.1mm Note: The color of the item may vary slightly due to photography and your own computer. Feature: 1. Focus lens, spare parts of laser engraver, laser engraving machine, laser cutting machine. 2. Film is solid, resistant to wipe. 3. Withstand high power density. 4. Double-side film, the filterability can reach 99%. 5. CO2 laser focusing lens is widely used in laser processing for example, cutting, drilling, sculpture, engraving and laser system. Specification: Material: ZnSe Color: Brown Design Wavelength: 10.6Î¼m Diameter: 18mm/0.7” Focal length: 38.1mm/1.5” Edge Thickness: 2mm/0.07” Dimension:18 x 3mm/0.7 x 0.11”(Dia x Thick) Weight: 66g Package Include: 3 x ZnSe Focal Lens 3 x Storage Case