This cable is a full copper cable, a 2C 2.5mm ,used for installation of celling speakers and other horn speakers within schools, worship centers, hospitals government house,conference room and halls.well insulated and made of the finest of copper. Plastic roll of complete 100 meters and used widely by sound engineers in looping and installation of all kinds of speakers: from calling speakers, to home theater systems, PA speakers and more... Highly durable for use.