Which Flummi jumps the highest? Who has the most beautiful bouncy ball? In just ten minutes, children will find out about this KOSMOS experiment set! With the special granulate and the different molds, 8 to 12 year old ball-round and angular spring balls can mix together in different colors. The night-lit Flummi, which shines brightly in the dark, is particularly cool. If he gets a pair of loose eyes, it gets really funny. If the first balls are dried after a few days and have lost their bounce, new ones must be made. How good that the granules in this set are enough for up to 20 power balls!Exciting info texts and fun facts explain why some colors glow in the dark and how the animals of the deep sea make use of this.This text is machine translated.