Taidacent 2 Wires 15A 20A 30A 40A 60A Slip Ring Collector Ring Rotary Electrical Contact (15A) - - Amazon.com
Taidacent Hollow Slip Ring Signal Power Continued 2/4/6/12 Road Collector Ring Conductive Electric Motor Slip Ring Rotating Connector (2 Wire 1.5A Inner Hole 7mm Outer Diameter 22mm) - - Amazon.com
What's the difference between electric and fiber-optic slip rings?