This Collector Ring is available only in 11 ring configuration An Absolute Encoder can be installed directly on top of the collector ring for field positioning and automatic controls Key Benefits: U.L. Listed to insure safety and quality. Copper brushes are 80% copper and 20% graphite for less resistance and heat build up Collector rings fit most all center pivots Available Encoder outputs include: 4-20ma, 0-5vdc, RS-485, Can Bus/Device net. All Encoders carry out a two-year warranty Wires are numbered and color coded for easy identification