The TEC Accessories Isotope Photon Fob is a premium tritium glow fob designed for durability and style. Constructed with a grade 5 titanium tritium housing, this fob is built to withstand tough conditions while offering an eye-catching glow. The Isotope Photon Fob holds a 3mm x 23mm tritium vial (not included) that glows continuously for years without needing sunlight or UV light. The vial is clearly visible through three large windows, offering an unobstructed view. The internal spring-loaded design, cushioned with shock-absorbing orings, provides extra protection for the vial. Made from scratch-resistant Borosilicate glass, the tube is further safeguarded by the viewing window frames. Installation of the tritium vial is simple—no tools required. Just unscrew the tail cap, insert the vial, and reassemble in less than a minute. Swapping vials for different colors is equally easy. Perfect for use as a zipper pull, keychain, or gear identifier, the Isotope Photon Fob helps you locate your gear in the dark or adds a unique glow to your setup. Features: ·Holds a 3mm x 23mm tritium vial (vial not included) ·Rugged Ti-6Al-4V titanium housing ·Shock-absorbing spring-loaded design ·Scratch-resistant Borosilicate glass tube ·Water-resistant o-ring seals ·Tool-free tritium installation ·Bead-blasted matte finish Elevate your gear with the TEC Isotope Photon—where durability meets a brilliant glow.