This shielded magnetic pick-up cable will help protect the trigger signal from the distributor-tor or crank trigger pick-up from electro magnetic interference (EMI). The pick-up wires are wound together and routed through a special aluminum skinned sleeve that connects to ground. This provides a ground shield around the trigger wires. The harness is six feet long and is equipped with matching 2-pin connectors. Recommended with MSD digital ignitions and aftermarket EFI racing systems.