ETA hand2mind Plastic Geometric Solid Blocks, Assorted Colors, Mini 3D Shapes (Set of 12) Includes a variety of geometric shapes such as cylinders, cones, triangular prisms, triangular pyramids, cubes, square pyramids, square prisms, and hexagonal prisms Show relationships between surface area, volume, and shape Shapes measure from 1/2 inch to 1 3/4-inch tall Shapes come in 4 primary colors: red, yellow, green, and blue Includes 32 mini relational geosolids