Mashable, Smashable, Buildable Fun! These magnetic balls are like magnetic putty, a stress ball and adult building blocks all in one! Smash them around for oddly satisfying stress relief or build a shape to unleash creativity. Thanks to their 2.5mm size and low flux rating these mini magnets mash all the way around! Produced from rare earth, neodymium magnets, these magnetic balls are possibly the most popular desk toy ever made. Make your environment a happier, more creative and more productive place through high-quality, tactile Stucky Balls! Here's a desk toy you won’t want to put down!  Features 512 Neodymium rare earth magnets Magnets are 2.5mm in size Packaged in an acetate clear carrying case Includes: White plastic splitter card & instructions