High Intensity 3870 Series is an encapsulated lens retro-reflective sheeting for permanent road traffic signs. It provides a high level of reflective performance appearing both bright and legible in daytime and at night. It is suitable for the production of durable road traffic signs, emblems, street nameplates and other general signs. This Class ref 2 material is approximately 3.5 times brighter than 3M Engineering Grade and is supplied with a 10 year effective performance life.