Pencil concept:
1. The larger the value of the H pencil, the finer and harder the pencil core, the more used for drawing sketches, the drafting of drafts, etc.
2. The larger the pencil number B, the thicker and softer the pencil core, and the more used for drawing sketches.
3, the most commonly used pencil is HB, soft and hard, pupils commonly used.
4, drawing because of the different requirements of the hook line and details, generally use 2-10B pencil.
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