The advanced ceramic burr mill mechanism is non-reactive & will never rust. The durability of this mechanism will outlast any metal-based grinding mill. The ceramic burr mill will not react to or absorb flavors from any spices. Enjoy a consistent fresh taste over and over again. The glass base is reusable and dishwasher safe. The materials used are the Burr Mill mechanism and the body is made of glass and the top is made of acrylic.