Hollow Sphere Math Kit, Packaging Type: Box, For School

A sphere is a three-dimensional solid with no base, no edge, one face and no vertex. A sphere is a round body with all points on its surface equidistant from the center. The reason to develop this manipulative is to demonstrate mass and volume of hollow sphere. This transparent manipulative has section of sphere, having plate with 3" diameter of sphere in side the transparent outer body. Measure outer sphere 5" & inner sphere 3"