Black wires, with yellow print. With black plug boots and coil boots. Ready to install. Low resistance 500 Ohm/ft. Ferro Spiral core, for maximum energy delivery, with a 8mm thick silicone jacket. The silicone insulation effectively eliminates RFI and EMI interference for a interrupt-free functioning of all on-board electronics. Fully compatible with both carburetor as the Delphi fuel injection systems. High temperature boots withstands over 500°F. Note: Compatible with all H-D ignition systems. If you have an aftermarket ignition, please check with manufacturer ohm requirements.