Bitz plate is made of sturdy stoneware. The combination of the plates exterior, matte glaze and the glossy glaze on the inside gives a unique and exciting expression. The plate can withstand machine wash, microwave and oven up to 250 degrees. Mix and match with other stoneware products from Bitz so you get a set that suits you. Bitz mat and reactive glaze make each product unique and color changes occur. Scratches will appear.