This experimental kit allows you to explore sound absorption using three different shapes. - Contents: 3 shapes (red triangle, blue cup, white sheet) - How to use: Experiment with 4 methods (blowing, tapping, flicking, rubbing) - Features: Sound-absorbing materials can be added, demonstrating sound absorption effects ★ Thank you for viewing. ★ After purchase, the box will be folded and packed compactly for anonymous shipping due to shipping costs. We appreciate your understanding. Please take a moment to read the profile before purchasing. We hope to provide a safe and secure transaction for our customers. #CatEarsPeeking