The set of 6 tea cup (popular as Kulhar or Kulhads) is made of clay. These are shaped by hands and then baked in the oven at the temperature of 950 C followed by painting them. This technique is called terracotta pottery and has a porous structure. Beautiful clay cups will be a wonderful gift for your friends who like guests! Cups can be placed in the microwave and oven. It is not recommended to put them on open fire. Clay product can not be subjected to sudden temperature changes. Wash it manually without detergents. Do not drop the product.