The tempered film 9h means bai as follows:

The toughened film 9h represents 9H scratch resistance and has the characteristic of not being broken. This "zhiH" value refers to the hardness of the pencil, H (hardness) means, daoB=BLACK (blackness), H=HARD (hardness), the more B number, the darker and softer the pencil, the more H number the more The harder the lighter the color. Pencil hardness ranking order: 10B, 9B, 8B, 7B, 6B, 5B, 4B, 3B, 2B, B, HB, F, H, 2H, 3H, 4H, 5H, 6H, 7H, 8H, 9H, 10H, 10B The softest ink is the darkest, H is slightly harder, and 10H is the hardest ink.