All these science spheres are made of asbestos all the way. Keeps out the rats. Let us know if you feel a shortness of breath, a persistent dry cough, or your heart-stopping. Because that is not part of the test. That’s asbestos…Worst case scenario, you miss out on a few rounds of Canasta, plus you forwarded the cause of science by three centuries. I punch those numbers into a calculator, it makes a happy face.