A wonderful product. The exterior of the upper part is plastic, but do not be mistaken, the construction is superb. The set of mechanisms is metal and ceramic grinding wheels do the job as is expected. I use to grind my coffee beans that I prepare a coffee plunger. However, I would not recommend this to people who change mill grind size often. Although this mill permits, the absence of reference does not make easy. I try to find me a way to create my own mark (count the number of turn of the clamping screw, this kind of DIY), but it is not too conclusive yet ...
