This transparent hollow sphere manipulative is designed to help students understand and demonstrate the concepts of mass and volume of a hollow sphere. It features a clear outer body with an inbuilt inner sphere, allowing learners to visually explore the relationship between the two. The model helps in better conceptual understanding of spherical structures through hands-on learning. It measures 12.5 cm for the outer sphere and 7.5 cm (approx. 3 inches) for the inner sphere, making it ideal for classroom demonstrations and science education activities
