Place your drink on these Radioactive Elements Glowing Coaster Set and they light up! Comes in a set of 4 different elements, each with their own color: Radium-226 (Red), Plutonium-244 (Blue), Uranium-238 (Green), and Thorium-232 (Orange). Don’t worry, they’re not actually radioactive, they’re battery powered. Pressure sensitive so they only light up when there’s a drink on them. Made of plastic and highly scientific.