Our life can't be completely out of the automatic pencil, there is a mechanical pencil, and naturally, the automatic pencil lead is indispensable. So what are the automatic pencil lead models?

The models are different according to different classifications.

1. From the carbon content of the refill, there are 6B--6H models.

       B is an abbreviation of English (Black), meaning black, soft meaning, H is the opposite, meaning hard, the larger the H value, the lighter the coloration, the larger the B value, the darker the coloration. Among them, class H pencils have relatively high hardness and are suitable for objects with relatively hard or rough interfaces, such as woodworking scribing, field drawing, etc.; HB pencil refills are moderately hard and suitable for writing under normal conditions; Pencils, refills are relatively soft, suitable for painting, and can also be used to fill some machine-recognizable cards. For example, at present we often use 2B pencils to fill in the answer sheet.

2. From the thickness of the refill, there are various specifications of 0.3, 0.5, 0.7, 0.9 (unit mm), and the number indicates the diameter of the pencil lead.

3. From the color of the refill, there are black pencils, colored pencils and other specifications.

       The above is the introduction of the automatic pencil lead model, different models need to use different models.

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