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Red Borated Dumet Wire 0.40mm Lighting Dumet Lead-in-Wire. Precise Nickel-Iron Composition: Core wire contains 41-43% Nickel with Iron balance, ensuring stable performance. Excellent Glass Sealing Match: Permanent matching with soft glass sealing due to compatible thermal expansion coefficient. Wide Application Range: Used in vacuum components, light sources, semiconductors, and various bulb types. Custom Material Options: Customizable materials including Nickel-Iron and Copper based on specific needs. Multiple Color Variants: Available in Red, White, Bright, Yellow, and other tinge sorts for diverse uses. Versatile Diameter Sizes: Diameter ranges from 0.18mm to 1.42mm to fit various electronic component specs.