You should pay attention only as an adult when washing the dice. Unfortunately I have a little careless crumpled the dice with the mirror film, because the film has got a small dent and now shows all distorted. Of course it was my fault, but a child can happen too firm a grip. Even the "chirping" red dice chirps no longer so easy after the first washing. Therefore, a deduction of points on the subject of "life" - but otherwise a thoroughly enjoyable and recommendable 5-star toy for young explorers.