Matt finish plastic to prevent reflection .Patented locating ring which guides the hand to the centre where the information can be found.Smooth contour lettering and pictograms .Light and dark colour backgrounds available to highlight colour contrast of background walls.High quality one piece die-moulded.Once fully charged, sign will glow for over 10 hours.Visible even in complete darkness.Tested to DIN 67510 Part 1 - 4 for afterglow performance whcich exceeds international standard for flammability, smoke and toxicity.