This acrylic grinder is great for three reasons: firstly, the pyramid shaped spikes make easy work of even the most stubborn herbs. Secondly, the magnetic pads on both sides of the grinder are to insure the safety of your herbs when the preparation process is under way.Last but by no means least, having a compartment to put your herbs in isn't a bad idea, whether you keep your herbs in their original state or pre-crumbled, its safe in your grinder compartment.