BLOMUS Sablo Ceramic Stoneware Espresso Mug Set of 4 - Ceramic Stoneware Espresso Mug Set of 4 - SABLO was designed by Frederike Martens, a German industrial designer with emphasis on glass and ceramics. Frederike designed the SABLO line taking inspiration from the natural materials of sand, clay and water. The shapes are soft and inviting with pleasantly rounded edges and a slightly rough surface in some areas and glazed in others.