120V Track systems are modular and can be designed for multiple applications in nearly any interior environment. J2 Track is a two circuit track system that can control lighting fixtures separately through two switches. Any "J" style fixture can work on a J2 track system. J-clips are used to set a "J" style track fixture on circuit 1 or 2 for J2 two circuit track systems. J fixtures already include J-clips, order these as replacement or backup clips.