A photoluminescent diagonal arrow sign. 4 inch by 4 inch square. An easy peel and stick application. Activated by natural artificial light, Safe-T-Nose Path Markings provide a steady glow to guide people in all lighting conditions. Glows for many hours after the lights go out. Unlimited recharging. The Brightest, Longest Lasting, Nontoxic, Nonradioactive Glow available. UV Light and Oxidation resistant. Smooth easy cleanable surface.