Radioactive Elements Glowing Coaster Set (Not Actually Radioactive) - LED Coasters Light Up When You Put Your Drinks On Them - Set of 4 - Plastic Party Beverage Coasters - 3 3/4in Square x 1/4in Thick - Batteries Included No Radioactive Elements are Actually Present (Too Expensive, and Too Radioactive) Coasters that light up when you put your drink on them Great for parties - easily remember which drink is yours Feature the atomic number and isotopic mass of the most stable or common isotope for each element Set of four comes in a box with the radioactivity warning symbol. Batteries included (8 3V CR2032 batteries)