Tray Cable is manufactured with stiff copper strands and used as a direct burial electrical cable. With NON flexible copper strands it's actually easier to work with because it won't coil or bunch up during the installation process. It comes in 18 awg through 500 mcm, 2 through 5 conductors, 600 volts and does NOT come with an additional ground wire. Tray Cable is a great universal copper electrical cable because it's direct burial approved giving it availability to all applications if needed.