– Completely contained and self-powered
– Glows continuously for 10 years (even in 10 years of complete darkness)
– Super compact design
– Ultra bright green glow
– Perfect for tagging zippers (on tents, bags, etc), tying on keychains, flashlights, etc
– Learn more about Tritium on Wikipedia.com
they say that the radiation from these is 100% harmless, but it seems like the type of thing that we’ll only find out after 50 years of exposure that it causes brain mutations.