Our 55mm 4layer Ceramic mars grinder coating is super low friction, so a VA ceramic grinder turns just as easily in 6 months as it did the day you got it. It’s an updated version of the aluminum Mars Grinder, which has a ceramic coating sprayed on the aluminum surface. It combines VAGrinders’ patented smooth circular design, olive-shaped teeth, and a ceramic coating that is non-stick and easy to clean.