What the ball is round bead pen?

- Dec 03, 2016-

The tip of the pen nib need to adopt hard and wear-resistant materials, the most commonly used material is stainless steel and tungsten carbide, the quality of the latter is better. Tungsten carbide is composed of tungsten and carbon compounds, belong to the cemented carbide production material, in black six-party crystals, hardness is similar to diamond, stable chemical properties, is a good conductor of electricity and heat.

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