Our last mystery box of the season and its only partly a mystery. Were excited to be offering the Mostly Electron, Mostly Mystery Box! This box has 9 mostly Electron Lab Second discs inside, with a chance of other plastics, like R2 Neutron, making surprise appearances. In addition, we put the next great experiment from MVP R&D inside a Prototype Eclipse Electron Envy will be in every box! Reminder, these are prototypes so variance in glow time is to be expected, but mostly expect an incredible disc!