This key ring with tritium gas tube inside which is self luminous and beautiful in the dark. It is a great decoration to attach to your backpack, key chain, belt loops.
Features: Tritium gas tube inside, self luminous, bright and visible in the dark. Long life span, glows continuously for 15 - 25 years. Super strong acrylic housing, waterproof and shockproof. With a ring to attach to your backpack, key ring, belt loop, etc. Compact and lightweight, no external power required, very easy to use.
Specifications: Material: Acrylic + Steel + Tritium gas Color: Blue / Yellow / Green / Orange / Red / White / Purple / Pink (optional) Size: S / L (optional) S: Dimension: 9 * 20mm Interior Tube: 1.5 * 6mm Item Weight: 2g