3 years & up. Explore an exciting new method of magnetic construction with Polydron HashMag - Magnetic Rainbow Construction Set . The unique shapes come in 6 stunning translucent colors, ideal for playing against a light source! 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 an understanding of polarity and is compatible with Magnetic Polydron. Includes 12 squares and 12 equilateral pieces. Building guide included for inspiration. BPA free.