GXSL Type of wire used in Metra Turbwires provides more flexibility, handles more power than cheaper wire kits so your speakers get all the power without any leaking out * TurboWires are heat resistant so they will last a lifetime * Turbowires are 7 inches in legnth so they are easy to install. Cheaper brands offer wires that are nearly impossible to install because the length is too short. * The ends of the turbowires are pre-stripped so installation is quick and easy * Made with the highest quality and precision out of any other brand