Staedtler Mars lumigraph pencils

Hi - I see that Matt is using these specific pencils in his recent Getting Sketchy episodes.
I just watched one of the course videos on pencils to see if he discusses them - he does not.
Can someone explain why these are better than regular graphite pencils? He did mention that they are a combo of carbon and graphite, but what is the benefit? (I tried using my carbon pencils on the ear episode last night but it is too black).

Thanks

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