Explore an exciting new method of magnetic building with Polydron Hashmag. The unique shapes come in 6 stunning translucent colors. Hashmag is ideal for developing fine motor skills and exploring the construction of 2D nets and 3D models. Polydron Hashmag has a color coding system to help develop and understanding of polarity and is compatible with Magnetic Polydron. Designed for the whole class to use, this 72 piece class set contains 36 triangles and 36 squares, along with a building guide included for inspiration.