Just for everyone's info, I did pose this question to "Performance Distributors Inc" ( D.U.I. - their "live wires" ). " Can you give me the build specs on your ignition wires?" Reply: " The wire itself is 8MM spiral core and the resistance value is 300-350 ohms per foot. The spiral core is stainless steel wire wrapped around a magnetic core. Thank you." No mention of any R.F.I. protection and I have no idea who makes them for the company. Not an endorsement. Just passing along the info I got from them. Like many, no tech info on their web sight.