Bitz egg cups made in black stoneware dia. 5.2cm. H5cm. The stoneware is made with a beautiful reactive glaze that gives it extra glow. The stoneware can withstand machine washing, microwave and oven up to 250gr. Bitz Matte and Reactive Glaze makes each product unique. Scratches and cutting marks will be visible. This is not an error. Bitz concept.