Set of three tritium glow rings, One Blue, One Green and One Pink,

This Self Illuminating Safety Device has been specially designed for marking equipment and personal property that may need to be found in the event of emergency during the hours of darkness. Glow continously for over 10 Years

Glow rings are laser sealed borosilicate glass vials which are internally coated with phosphor injected with gaseous tritium which reacts with the phosphor to create a cold energy which produces a low level light source with no filaments or heat dissipation and no risk of fire or explosion.
They are unaffected by water, oil and most corrosive materials and require no external power source or exposure to light, remaining fail-safe and maintenance free with a lifetime in excess of 10-20 years