Features:100% brand new and high qualityTritium gas tube, self luminous, bright and visible in the dark.Long life span, glows continuously for 15 - 25 years.Perfect for decoration, jewelry, glasses, clock, etc.Suitable for indoor and outdoor use.Maintenance free: easy to install, no maintenance required.Use range:The tritium gas tube can be directly used in aerospace, instrumentation, subway, tunnel, fire,etc., and civil industries such as jewelry, watches, fishing gear, luxury goods,glasses, gifts and other industries.Specification:Color :Green/Sky blue/Blue/Red/Orange/White/PurpleQuantity: 1PCSize:3*15mmPackage Include:1PC*Tritium Gas Tube Light onlyNote: 1.Please allow 0.1-0.3cm differences due to manual measurement, thanks.2.Please understand because of the light irradiation or computer display difference, so I  can't guarantee photos and real color is 100% the same.