This is a handmade cup made from Stoneware clay on the pottery wheel. It was dipped in a Copper Red glaze and fired to about 2300 degrees F. in a natural gas kiln. This cup was in a more oxygenated area of the kiln, so it has green hues produced by the kiln atmosphere. The cup is 100% functional, dishwasher safe and microwaveable. It measures about 6" tall by 4" wide.