Made of high quality environment-friendly silicone material, it's durable, non-toxic, safe for everyone to play. The fidget toys offer 2 ways to play, you can press these bubbles down and they make a slight popping sound, you can also hold the center side with one finger and spin it with the other hand, repeated rotation practice helps to relieve stress, By spinning the fidget toy, it produces beautiful color effects when it spins to maximum speed, which is endless fun.