Well, that little one looks pretty cool. First, it's not for everyone. If you've got money and you're into that sort of thing (radioactive tritium in a titanium keychain) then by all means check this out. It's a lot smaller than you think unless you analyze the photo with a quarter next to it. I ordered vials of tritium from another supplier. The vials are very easy to install. The only thing I don't like is the key ring that comes with the kit. It's made of some kind of very inelastic alloy, and after I attached it to my keys, it didn't return to its original shape. It's frustrating when the price of what people usually spend a few dollars on is high. I ended up using another ring I found in my random drawer. Luckily the price and the super tough split ring don't change the fact that this thing is super cool. I've had it for over a month and have had no problems with broken bottles or scratches/stains. Tritium vials emit the perfect amount of light for you to see in a dark room. Please note this is not a flashlight. I chose all blue, but you can choose any color combination offered. Like I said, while it's not for everyone, I enjoy the fact that I'm carrying around radioactive material that glows.
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