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With an exterior constructed from TC4 titanium alloy, three polycarbonate viewing windows, and a tritium core that glows automatically for up to 25 years, MecArmy's TR25 Glow Bar is the perfect addition to your keychain - whether you have a penchant for losing your keys in the dark or just want to add some futuristic flair. Waterproof to 100 meters, impact resistant to 2 meters, and featuring a dent and scratch resistant finish, this little device was built to take a beating.