... because two lumisnescent core wires inside. It is suitable to use in a circumstance of high-brightness demand such as safe indication,advertisement ... ,sign. It can stay in the shape. 2.Diameter:3.2 ... ,yellow,green,orangeEL wire soldering:1.EL wires usually come in rolls,like 50m/roll,100m/roll,200m/roll,300m/roll ...