This is a listing for one titanium bead, available in three different finishes (stonewashed, natural or black DLC). 
It comes with four pre-installed Tritium vials (vials size, 2mm x 12mm) in green, ice-blue or blue Tritium colours.
Brightest color is green (100%), followed by ice-blue (at 80%) and blue (at 60%).

Note: The central hole is about 7mm in diameter and is wide enough for two pieces of 550 paracord.

Size 18mm x 17mm, Weight 12gr.

Tritium (symbol T or 3H, also known as hydrogen-3) is a radioactive isotope of hydrogen and one of the most valuable substances on earth, with a market price of 30.000$ per gram.
The Tritium vials used are light sources of gaseous tritium isotope, hermetically sealed in glass.
This radioactive tritium gas glows completely on its own, in a very safe manner, without needing to be 'charged' with light as required by most phosphorescent glow in the dark products. The glow will be subtle and visible in low-light conditions; the darker the better. It will not be visible in daylight or well-lit areas. Unlike glow-in-the-dark materials, tritium needs no charging and doesn't fade after a few hours: it glows continuously, day and night, for 20 years and more. Its brightness decreases slowly and predictably, to about half after 12 years. This is truly a ''nuclear powered'' item!

Worldwide international shipping, signed-for. Delivery takes 1-5 weeks (1-2 weeks for Europe/ 2-5 weeks rest of the world).