I believe it is a charcoal pencil. I watched a video he made that explains how to sharpen different kinds of pencils: https://www.proko.com/course-lesson/sharpening-6-types-of-drawing-pencils/discussions Here's one where he shows how to sharpen charcoal pencils: https://www.youtube.com/watch?v=tAzoC9RnIUk&ab_channel=AhmedWifky It's incredible how much free content he publishes. Bless him.