Speks magnetic desk toys typically use neodymium magnets. Neodymium magnets, also known as rare-earth magnets, are strong and durable magnets that provide the magnetic properties required for assembling and shaping various structures and patterns with Speks. These magnets are known for their strength and ability to hold their magnetism over time. The use of neodymium magnets in Speks allows for creative and interactive play, as these magnets can be manipulated and connected to create a wide range of shapes and structures. However, it's essential to handle them with care and follow any safety guidelines provided by the manufacturer, as neodymium magnets are strong and can pose risks if swallowed or if they come into contact with other magnets.