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This transparent manipulative helps understand complex calculation of surface area, volume & mass of hollow cylinder (pipe).Measure Ht.14cm X 10xm (OD) & 5cm (ID), duly packed in reusable box

Hollow Sphere Is to demonstrate mass and volume of hollow sphere. This transparent manipulative has an additional section of an inbuilt inner sphere, measurement 7.5 cm in diameter inside the transparent outer body. Measure outer sphere 12.5 cm & inner sphere 3”