When mechanical pencil leads get under 0.5 mm the chance of breaking the lead when writing increases greatly. I think 0.5 mm is the sweet spot, but I will use an 0.3 mm pencil from time to time, knowing that it might cause frustration. 0.2 mm seems like a pipe dream, but the Pentel Orenz introduces a new feature to help prevent breakage that actually works.
With the Orenz, Pentel has created a lead guide pipe that fully protects the lead and has a rounded edge so you can write without the tip scratching or catching on the paper. This sounds like it wouldn't work, but I am here to say it works exactly as advertised.
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