Oxford Porcelain Tumbler, 10-Ounce, Black, Set of 6 Strong and Resistant Set of 6 tumblers- 10 oz each Created using Environmental Friendly Practices 100% Lead Free- Microwave and Dishwasher safe Less than 1% porosity, blocking moisture absorption which can lead to cracking, crazing and rippling along the interior High-quality exterior enamel protects against metal marks and other damage.