Self-luminous 25-year Tritium Gas Tube 1.5x6mm

Self-luminous 25-year Tritium Gas Tube 1.5*6mm
Size: 1.5x6mm
Color classification: 1.5x6 green one, 1.5x6 ice blue one, 1.5x6 yellow one, 1.5x6 red one, 1.5x6 purple one, 1.5x6 white one,
Tritium tubes do not require any energy and can self-illuminate for about 25 years. The fluorescence of tritium gas is weak and cannot be observed during the day. In dark places, you can find it glowing. The reverse Velcro design can be used as a backpack or clothing with Velcro stickers, or as a zipper puller.