Super strong round neodymium magnets. These magnets are made of a brittle material. They are not as strong as steel, they are more like a brittle ceramic. If you let two magnets slam together, they can crack and break. This is true for magnets both large and small.
Strong magnets should be kept away from ironware and easily magnetized iron products, such as monitors, credit cards, computers, televisions, mobile phones etc.
These magnets are very powerful and should be handled with great care. Do not allow children to play with magnets without adult supervision as they could get injured. Pay extra attention to the small magnets, please place them somewhere safe, where children can't reach them.