The NanoSlider Solo is a cord slider or bead for lanyards. Two 4mm holes fit paracord or similar cords, and in the center is a cavity fitting a 1.5x6.0mm tritium vial.
Vials can be purchased from Veleno Designs
This lantern will require cleaning of the internal cavity for the vial. This is best done with a 1.6mm drill bit. Please visit my web page for more information.