Reactor core style bladeplug, To be used in sabers that use a 1" OD blade, or use it as a Crystal Chamber for a stunning look! NOTE: Be sure to add a light-dimming/blocker insert such as the Sprocket Core II available in our store. When printing in a transluscent material, add paint or another lightblocker. Unfiltered LED light may result in retina damage. Metrotech Machinery does not accept responsibilty for physical harm done by improper use.