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High-Performance Custom Silicon Nitride Ceramic Rods for Industry. Customized Size: Size is available in customized dimensions to meet specific application needs. Superior Hardness: Mohs hardness of 9, making it one of the hardest substances in the world. Lightweight Material: Low density of 3.2g/cm3, significantly lighter than steel and superalloys. Full Customization Options: Supports customization from designs, samples, and flexible requirements.