These 3mm sphere magnets (sometimes called buckyballs) are made from Neodymium which is the most powerful of all permanent magnets. Neodymium magnets are used when the strongest magnetic force is required with the smallest volume of magnetic material present.
These magnets are commonly used to make intrinsic sculptures and displays. Due to their strength, they are able to hold these structures perfectly.
Be careful when handling these magnets around stronger magnets as there is a risk that they could chip or crack under strong impact.
These magnets are not suitable for children and should not be purchased as toys.
If these magnets are accidentally ingested you should go to the hospital immediately as they can be very dangerous.