Luciano High Borosilicate Round Glass Storage Container Set This set of Glass Containers is composed of 4 items with their covers. The Glass Containers are made of High Borosilicate Glass, which means they can be used in the oven, on gas, in microwave, as well as put in the freezer. They are also dishwasher safe. These containers are thus extremely useful because they can be used to cook, and then to store the remaining items in the fridge or in the freezer. The covers are made of colorful PC Lids. The round glass containers can be stored inside each other for minimum space usage and practical storage. Containers sizes are 230ml, 450ml, 950ml and 1650ml. These glass containers are made in China in Luciano Glass Factories. The Lids are bought from a high reliable plastic supplier and guaranteed for safety.