The length is 172mm or more in JIS standard.
The first person to decide the length closest to this is Germany Luther Farber. It proposes to “7 inches (17.78 cm)” around 1840. This length is said to have taken the length from the place of the adult hand to the tip of the middle finger.
The maximum diameter is 8 mm or less according to the JIS standard..
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General Info Catalog
General Information of Tombow 2024-2025 Lineup of all products of Tombow
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