The glow inside a Glo-Disc or Glow Ring is created by a small, self-activated cold light source called a traser.

Trasers are produced by using highly specialised technology. Each Traser is a small hollow glass tube, which has been internally coated with a phosphorous material, injected with a special gas and then sealed by a laser.

The gas inside the tube excites the phosphor, which creates a cold light that will glow for ten years without any external power source.

As with many products we now take for granted, this military development will find hundreds of uses in our homes and workplaces.