The Sicilia 3-piece salt and pepper set is green-rimmed and made of stoneware. Stoneware is a clay-based material used in the production of plates and dishes, fired and baked at temperatures of 1100-1300 degrees. It is much more durable than ceramic and less absorbent of water compared to ceramics. Due to being fired at higher temperatures, it can be safely used in microwave, oven, and dishwasher for many years.