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Picking the Perfect Pencil Lead Hardness Grade - JetPens.com
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日期：2025-06-25
This chart shows pencil lead hardness grades from 10H to 10B, using Uni-ball Hi-Uni Wooden Pencils. There are two systems for grading lead hardness -- the European system uses letters (like HB), while the American system uses numbers (like #2). Generally,...看更多
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