Taidacent Hollow Slip Ring Signal Power Continued 2/4/6/12 Road Collector Ring Conductive Electric Motor Slip Ring Rotating Connector (5mm Inner Diameter 22mm Outer Diameter 6 Wire 2A) - Amazon.com
SENRING Mini Slip Ring Electric 12.5mm 12 Wires 150RPM 240 VDC/VACSignal Transmission Rotary Joint for monitor Robotic - Amazon.com