Our sensory fidget toys come with 6 set, each set designed with 21 bubbles, you can combine any of them and enjoy endless ways to play with your friends and families. The man who press the last bubble would be lost. The toy is made of premium silicone, harmless and safe to humans and pets. It's not only an education toy that can decrease kids' anxiety and train their basic math, but also ideal for people with autism, the ADHD, the elderly, children and adults who need to relieve stress.