An easy-to-drink coffee cup

The coffee cup or mug we usually use is generally parallel to the bottom at the mouth of the cup, which is not very suitable for the structure of the lips. If you design an arc at the mouth of the cup, it will be especially suitable for our lips when using it, it is very comfortable to use, and it is easier to drink coffee inside. As a matter of fact, there are already many such cups in the market, but there are very few friends in this field, so they are specially introduced to you. Maybe it's just such a small change, the price of the cup will be higher.