This is a handmade mug that can be used for coffee, tea or any other drink of your choice. It is made from Stoneware clay on the pottery wheel. It was dipped in a wood ash glaze called a Nuka glaze, and then brushed with Iron and Cobalt blue stain to give an earthen, rustic color. The rust and cobalt blue dripped down the glazed pot during the firing, creating blue and yellow colors in the cream colored base glaze. The mug is 100% functional, dishwasher safe and microwaveable. It measures about 4" tall, width 5" including handle. This mug is perfect for that every day small cup of joe to get you going in the morning.