This is a 20x8mm polished brass fob with 2 or 3 2x12mm tritium vials installed. It has a 4mm hole for your paracord as well.
It’s $45 for the 2 vial version and $57 for the 3 vial version excluding the usual $2 shipping and additional $3 for registered shipping with tracking number. Hope you guys like this.
Here you go. The slits are cut all around the entire fob leaving the core of the fob to support the structure. Let’s say if I empty out the core to contain the four vials, then slit the sides to reveal the vials, the fob will effectively be sliced into pieces.
That idea did come to mind but then that would defeat the purpose of using four vials when only two quadrants are exposed by the slits. It’s quite a dilemma actually.
These are tritium vials that glow continously without the use of external light source or electricity for 12 years before they reach half their brightness. You may refer to the below link for more information on tritium illumination.
Apologies for my oversight. Yes, these can be attached to keys using a paracord through the hole in the centre of the bead. They can be attached to flashlights, bags, knives, zippers, and anything you wish to locate in the dark. Hope this answers your question.