I'm just quoting what it says on the bottle. No grit rating and it says "Non-abrasive".
It's certainly very, very fine. Two minutes of polishing at 500rpm on mild steel yielded no measurable reduction in diameter of a cylinder for VarmintAl. Measuring a cylinder doubles the measurement because you're polishing and measuring both sides. So even doubling the measurement was undetectable with his micrometers.
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