https://www.youtube.com/watch?v=OH0wu4xICQ8

Made from rare earth, neodymium magnets, Speks magnetic balls are possibly the most popular desk toy ever made. Speks are like magnetic putty, a stress ball and adult building blocks all in one. Mash them around for oddly satisfying stress relief or build a shape to unleash creativity.

Warning use at your own discretion.
Do not put near or in nose or mouth. Swallowed magnets can pinch and stick together across intestines causing serious injury or death. Seek immediate medical attention if magnets are swallowed or ingested.