"A slip ring is an electromechanical device that allows the transmission of power and electrical signals from a stationary to a rotating structure. A slip ring can be used in any electromechanical system that requires rotation while transmitting power or signals. Slip ring can improve mechanical performance, simplify system operation and eliminate damage-prone wires dangling from movable joints. 22AWG, 17AWG,14AWG,UL, color Teflon, silver or tin plated 6,12,18,24，36,48 5A,10A ,15A，20A or combined rings to get higher current http://www.btslipring.com"