Trigalight Tritium Vial 1.5mm x 6mm Capsule - Made in Switzerland - These are the original Swiss made Trigalight Tritium capsules as used in many high-end Swiss made watches. The electric energy in the trigalight is generated by the tritium gas, a beta emitter. When decaying the tritium losses electrons. When such an electron hits the powder layer it is captured and transformed into light. Tritium vials are self-powered and do not require power, light or other sources to provide illumination! Ideal for use in TEC Accessories Glow-Fobs and Isotope Fobs, Flashlights and sights. Popular as decorative accessories for outdoor equipments among EDC enthusiasts. Diameter: 1.5mm Length: 6mm One piece supplied Colour of your choice Ideal for: Modifying TEC Accessories Glow Fobs Fit directly into TEC Accessories ISOTOPE Fobs DIY Projects such as pendants, fobs, custom keychains, lanyards, flashlights, sights Note: Tritium capsules should be handled with care to prevent breakage as the tubes are made from glass.