YM0771S Materials: Rare earth， Neodymium iron boron Process: Three-layer plating Sphere diameter: 4.8 mm Contains 216 magnetic spheres Up to 5000Gs of magnetic force Magnets can be shaped and designed in unlimited ways Great for training your imagination and creativity Also functions as a necklace， bracelet or other accessory Package Details Weight: 103.79 g Size: 5*4*3 cm Package Includes * 4.8mm Buckyballs Neocube Magnet Toy 216pc Set