After high temperature and high pressure firing, the high hardness ceramic grinding core features great wear resistance and corrosion resistance for a longer service life. The transparent bottle made of thickened acrylic and make it easier to observe the seasoning. This upgraded pepper grinder adopts advanced gravity sensing design, that you don’t need to use switch. You just need to tilt the auto pepper grinder down, it will start automatically, and the blue LED light will automatically illuminate.