Educational and Fun: This stem science kits allows children to create their own percussion instruments, which not only enhances their hands on ability, but also helps them learn scientific and understand the principles of sound production and propagationInnovative Design: The unique design of the can imitate the effect of thunders, allowing children to experience the charm of technology during play and their interest in scienceEnvironmentally Friendly: All materials included in this percussion instrument thunders tubes is made of environmentally friendly paper materials, ensuring the secure of children during useCompact Size: Measuring 20cm by 7.5cm, this portable instrument is easy to handle and store, making it convenient for both home use and travel entertainmentApplication: Science toy is suitable for a wide range of people, including primary school students and parents who want to strengthen parent child relationships through shared activities Specification: Material: Paper Size Chart: 20cmx7.5cm/7.87inchx2.95inch Package Includes: 1 Spring Drum Thunder Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.