This set includes 12 3D shapes in 5 colors: red, orange, yellow, green and blue. Fill the shapes with liquid or solid materials to compare volumes of different shapes. The removable stoppers prevent spills during activities. Each shape comes with a foldable plastic insert, which helps children visualize the sides of each shape. This set demonstrates a variety of STEM concepts such as measurement, volume, capacity and shape attributes. Made of shatterproof plastic, these manipulatives are ideal for classroom learning. The set is packaged in a sturdy box with cardboard sorting tray to keep the shapes in place. || Size of bases: 3.1"W. For ages 3+.