This geometry 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 folding plastic nets, which helps kids visualize the sides of each shape. This classroom set demonstrates a variety of math concepts such as area, measurement, volume, capacity and shape attributes. Made of shatterproof plastic, these manipulatives are ideal for classroom teaching and learning. The montessori 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+.