For off-road, marine, racing, or other extreme environments, the MSD Blaster High Vibration Coil is the best choice. The sturdy metal housing is completely potted with a premium grade epoxy to completely encase the coil's primary and secondary windings. This protects the coil from high and low frequency vibrations. Alkyd material is used to form the spark tower because of its high dielectric characteristics. Alkyd will not carbon track when high voltage is passed across its surface. For convenience, a standard canister type coil mount can be used. The coil can be mounted in any position.