Which of the following grades of leads is the hardest?

Which of the following grades of leads is the hardest? Correct Answer 6H

6H is the hardest grade of lead. The softest grade is 6B. HB is the medium soft grade. Generally, for educational purposes, 2HB pencils are used to make drawings. B is soft and H is medium hard. As the prefix number increases, the softness increases in B and the hardness increases in case of H.
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