This is recommended for the more experienced sharpers. It gives crisp angles and wont wear out like the graghite. We have been field testing this product for the last 1 1/2 years, with instructions to try to make it fail. We never succeeded. At the end of the field test, they show minor wear after severe use. I sharpen at least 200 blades every week, and intentionally sharpened blunt edges, used more pressure than normal, and tried to generate heat or excessive wear, to no avail. Keep the graphite for things that you can't use the glass for like inside curves. Soon to come is the soft platens which is for strong inside curves.
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