im about to get a grinder online, and i dont know if i should get an aluminum one, or a non aluminum one. cuz i dont know what non aluminum grinders are made out of. thanksAluminum is a good choice if you plan on using it to grind more than just coffee. Plastic tends to soak up flavors due to oils in coffee, herbs and spices. So if you plan on multitasking metal is the way to go.they can be made outta plastic or wood, prboably something else..but i can\'t thnk of it. ive had a plastic 1 and it still worked great..even though it was the ch eapest grinder in the store. so..personal preference really. glOther related question