Radioactive Bats Halloween clay slice sprinkles. Bats are a size 5mm and are a little on the thick side. THESE GLOW IN THE DARK! Just expose to light for a few seconds and look at it in the dark. You will get a 5 gram bag by weight, not a jar. Great for arts and crafts and diy projects, resin, etc. Too thick to work with nail art. You might be able to encapsulate them but I have not tested this. Please conduct your own testing before using in final project. Not edible.. See how big a 5 gram bag is at this link: click here