This transparent manipulative is designed to help students understand and visualize complex calculations related to the surface area, volume, and mass of a hollow cylinder (pipe). Its clear design allows learners to see internal and external dimensions for better conceptual understanding. The model measures 14 cm height, 10 cm outer diameter (OD), and 5 cm inner diameter (ID), and is neatly packed in a reusable box for safe storage and classroom use.
