Included in the set are six Mugs that are Clear. Tempered glass that can withstand shock is 2.5 times more resistant to breaking and chipping than regular glass, and it can also withstand sudden changes in temperature, ranging from -4 degrees Fahrenheit to 212 degrees Fahrenheit. The glasses adhere to the highest standards of hygienic practice. It does not absorb liquids, colors, or flavors because it does not have pores and is impervious to these things. Suitable for use in the dishwasher, the refrigerator, and the microwave. Products have a longevity that allows them to keep their original appearance.