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a Lightweight and Oleophobic Sapphire Glass Optical Lens for Kayaking Tools. Extreme Hardness: Mohs Hardness of 9, second only to diamond, ensuring superior scratch resistance. Customizable Options: Supports customization for shape, size, coating, and design based on specific requirements. Chemical Stability: Excellent resistance to strong acids and bases; insoluble in water. Certified Quality: RoHS and ISO9001 certified with 100% finished product inspection. Low Birefringence: Crystal birefringence of 0.008, ensuring high optical clarity and homogeneity.