From the Manufacture Rock Blanc Collection. The Manufacture collection from Villeroy & Boch combines premium porcelain with high-quality craftsmanship. Inspired by natural materials with strong colour accents, Manufacture Rock and Rock Blanc offer a look that resembles natural slate. A light glaze that’s added over the porcelain gives each piece a rustic, from-nature look. The black colour of Manufacture Rock resembles natural slate, while Manufacture Rock Blanc offers texture in a crisp white. Premium porcelain. Dishwasher and microwave safe. Made in Germany