The featured photo-luminescent round shape sticker is designed to glow in the dark. It flaunts a high performance and works as an immediate light source in case of sudden power failure and prevents fatal disasters. This photo-luminescent tape can glow for a long time and are great for using as guidance marking. 

other details: 

• 1. 18mm round shape sticker (16pcs) 
• 2. brightness: AF grade (can last for 6-8 hours) 
• 3. conform DIN 67510-4 class D level