Speks are made from the rare earth element, neodymium along with some iron and boron. First they're shaped into 2.5mm spheres, then they're coated with a metal plating or polymer paint, and finally they go through the magnetizer. It's cool - one minute they're just ball bearings and the next they're magnets.
- Best Gifts -- The 5mm tiny magnetic balls are the perfect gifts for friends, families, and colleagues, ship from the USA.
- High Quality -- Each ball is flawless, never fade, flexible and continuous changing shape. They are powerful, so you don't need to worry about losing them.
- Creative toy -- Making brain to think about how to build, make you feel productive and more energetic.
- Stress relief toys -- This magnetic building set contains 1000 magnet balls. laying it to releases the stress out of you and get the entertainment when you are busy at work with a large stress.