The Traser Keychain. Unfortunately, the means of construction makes them unavailable for purchase in the U.S. Anyone overseas want to ship me one? Please Register or Log in to view the hidden image! Trasers are laser-sealed borosillicate glass vials which are internally coated with phosphor injected with gaseous tritium which then reacts with the phosphor to create a cold energy which produces a low level light source with no filaments or heat dissipation and no risk of fire or explosion. Quick question for the science geeks: isn't tritium wickedly expensive to produce? :m: Peace.