This is Novak's Brushless Motor Shielded Sensor Harness, available in three lengths: 4"/100mm (#5351), 6"/150mm (#5352) and 9"/230mm (#5353). These are the replacement harness for all Novak Ballistic series brushless motors that feature a replaceable sensor harness. Features a shielded rubberized material to protect the sensor wires. Cable ties included.