Geometry is much more engaging with hands-on, 3-D manipulatives! This set of 12 see-thru blue geo shapes (with removable filler caps for volume and mass measurement!) includes a: sphere, hemisphere, cone, cylinder, two pyramids (one triangular base, one square base), triangular prism, hexagonal prism, cube, and three cuboids. This set of manipulatives is designed for use with (and is included in) the ShillerMath Kit II. Five ShillerMath lessons use this item: Book 5: 2 lessons & Book 6: 3 lessons. Largest shape is 2" across; smaller shapes approximately 1" across.