The HellermannTyton 561-02302 Wire Labels & Markers Clip On Cable Marker Set 2.8-3.8 mm is designed for marking a wide variety of cables with various colours, imprints and symbols. This set includes labels with "L1", "L2", "L3", "N" and an earth symbol for clearly indicating the cable to which each refers. The clip-on markers easily attach onto the cable, ensuring a secure and reliable connection. The labels are made from tough polyamide which can withstand extreme temperatures and harsh environments. The material is self-extinguishing for fire safety. This marking set is suitable for home, commercial, electrical, audio and other cable projects.