Every element was intentionally designed to function well. The lip is thin enough it doesn't dribble but thick enough it doesn't chip easily. The bottom has added weight to keep it upright as you play with it. Each one is thrown by hand on the potters wheel so they each have their own unique characteristics making them unique even though you can also put together a set.
The black tipsy tumbler makes a wonderful gift for dad or a hostess gift or a little treat for yourself!