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Pilot's Neox graphite is what Pilot describes as "high purity graphite". This graphite has fewer impurities than most which gives Neox a smooth, almost lubricated, feel while writing.
The pureness of this graphite also gives it greater strength so you're unlikely to have as many breaks as you might with other brands.
Compound this high quality lead with the Mogulair mechanical pencil for one of the best writing experiences.