The Mighty Line luminescent tape illuminates the way to safety in the event of a power outage. It has a 1/2-inch wide, co-extruded, glowing center line that is part of the tape. It is glow-in-the-dark peel and stick tape. The tape is very durable and is very long-lasting. Customers have reported Mighty Line tape installed in their facility lasting over three years! Given the right care and proper installation, Mighty Line tape can last a long, long time. 4-inch by 100-feet, yellow with glow-in-the-dark center line.