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The functions of several commonly used models of hypodermic needle pens



Commonly used sizes of technical pens include 0.3mm, 0.5mm, and 0.8mm, suitable for most drawing and writing scenarios. 0.3mm and 0.5mm technical pens are the most commonly used sizes, suitable for general drawing and writing needs, while 0.8mm is suitable for scenarios requiring thicker lines. In addition, 0.05mm and 0.1mm sizes are suitable for detailed outlining, while brush pens are suitable for writing brush-like characters or outlining.