I would not have believed that I sometimes rezensiere a coffee mug, but these still have a hidden feature that should know the inclined buyer. Filled to this double cup with a hot drink, they give to the empty drinking a loud "ping" can of itself. This is no joke, but physics: hot metal expands and cools it plingt up (at least these cups, the inner bottom jumps abruptly back into the starting position). Initially, we are always winced, but after we got used to it, bets were busy in the camping holiday with every use completed, whose cup (after simultaneous empty beverage) first plingt. With a little skill you can thus also shoot water droplets. Definitely has a certain entertainment value. However, if you're looking for peace, should rather resort to single-walled cups (such as by Tatonka), perhaps there is also noiseless double? This for here have the advantage that they do not get so hot outside through this construction and the tea or coffee not so quickly cools. Therefore, I give 3 stars.
