Learning Resources Primary Science HorseshoeShaped Magnets. These brightly coloured horseshoeshaped magnets are made of durable plastic, perfect for young scientists. Magnets are magnetically correct: one foot north, one south. Set includes six horseshoe magnets, each in a different colour; yellow, pink, red, green, blue and orange. Magnets measure 12.5cm H. Suitable for ages 3+