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Customizable Quartz Optical Lens for Laser Protection 27.9X4.1mm. Premium Quartz Material: Made of high quality quartz crystal for irradiation resistance and stable performance. Anti-Reflective Coating: Double-sided coating with high efficiency, low loss, and low scattering properties. Customizable Thickness: Thickness can be customized to meet specific laser application requirements. OEM/ODM Service: Professional OEM and ODM customized service available for laser accessories. Fast Delivery: Goods mostly in stock with normal delivery time of 1-3 working days. Factory Price: Competitive factory price with discounts available for new customers.