Radioactive Elements Glowing Coaster Set. Featuring the atomic number and isotopic mass of the most stable or common isotope for their respective radioactive elements, these pressure-sensitive coasters light up when you put your drink on them.
Choose to set your drink down on:
Radium-226 (Red)
Plutonium-244 (Blue)
Uranium-238 (Green)
Thorium-232 (Orange)