Material: Hight class USA Imported II-VI CVD ZnSe material Diameter: 12mm/0.47 inch; Focal Length:101.6mm/4 inch;Thickness:2.2-2.3mm;Transmittance: ≥99.8% Adavantage: Double-sided solid coating to reduce the loss of laser,Wiping resistant,Extended durability,Precision slicing polishing and grinding processes,High temperature laser resistance,Excellent optical properties,Smaller focus spot size,Good engraving and cutting effect,High working efficiency. Usage: Be used for CO2 laser head,laser engraver and cutting machine,DIY and various CO2 laser systems. Application: It is widely used in cutting, engraving, drilling, welding and other CO2 lasers; it has good performance for 10600nm 10.6um CO2 lasers., Manufacturer: Shanghai Top Nine Industrial Co.,Ltd