A design that is practical, unique and visually appealing makes this an exciting insulated double wall mug/glass cup/tea mug/product for any home, restaurant or cafe. The double wall insulation stylishly keeps the liquid hot whilst the outer wall of glass remains comfortable to the touch. Crafted from strong high end borosilicate, makes these glasses thinner, lighter, capable of withstanding thermal shock, scratch and break resistant, as well as dishwasher, microwave, and freezer safe. Wow! 4 PCS set.