Other than the packaging, these Deleter nibs are the same as the Nikko versions of those same nibs.

Nikko and Tachikawa nibs are both made by Tachikawa, but Nikko nibs are made to be slightly more flexible than Tachikawa nibs. We recommend Nikko nibs for people with lighter writing pressure or who prefer more line variation, and we recommend Tachikawa nibs for people with heavier writing pressure or who prefer less line variation.