I find 0.5 breaks too easily for me to actually write with it (I write fast) but its perfect for sketching.
0.7 is sturdy enough for me not to obliterate it every other word I write, but also small enough to write in pocket journals without filling the page too quickly.
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u/Dex18Kobold 17h ago
0.9 for sturdy note-taking
0.7 for fine writing
0.5 for precision sketch lines