neodymium magnets are also known as earth magnets, and are the most powerful type you can get.
i bought 3 disc shaped ones off ebay, just for fun - they're pretty much impossible to prise apart, and when you do they're liable to snap back together, trapping the end of your finger in the most painful way possible!
They're so powerful they can easily de-magnatise a credit card or harddisk, so basically ive had to stash them in a box in a draw out of harms way 😁
