Food safe zinc alloy metal grinding mechanism is designed to actually grind the pepper, maximising flavour and aroma Adjustable grind Durable all metal body and flanged base for stability Hand crafted to exacting standards in Thessaloniki, Greece. Brass and copper will naturally change appearance and develop an attractive patina of use over time. This normal oxidising process will occur in unpredictable ways with touch and exposure to moisture and humidity. The mills require some regular care and cleaning and the contents should be kept fresh and dry. The manufacturer provides a limited warranty, however this does not cover changes in appearance or corrosion of the mills which can be managed with regular care.