"What Is It?" REUSABLE Clear Acrylic Cups / Glasses, 4.75 Inch, Set of 4 Includes a set of 4 cups - Clear Made of Acrylic which is washable and reusable. Made to look like traditional plastic cups but they are not plastic. Dishwasher safe. Not microwaveable Measures: 4.75 inch tall Also available in blue and red. Plates and bowls also available.