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
Question about reliability of Sliprings use with RS485 and arduinos - General Discussion - Arduino Forum
Slip Ring Power Connectors: A Comprehensive Guide - Grand
Slip Ring with Flange - 22mm diameter, 6 wires, max 240V @ 2A : ID 736 : $14.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Taidacent Hollow Slip Ring Rotary Electrical Contact 2/4/6/12 Wires Collector Ring Conductive Electric Motor Slip Ring Rotating Connector (6 Wires 10A Inner Hole 12.7mm OD 54mm) - Amazon.com
BTH1235 Slip Ring In Robot - News - ByTune Electronics Co.,Ltd