40 ohms resistance as stated on the box in my hand lol apparently stock is 10,000! I like them though they appear to be of very high quality. They have very interesting bendable boots for header clearance. Im used to the motorsports wires that are 90 degrees on both ends. ps. am I the only one that finds trying to separate the ignition wires a flippin pita? I got them pretty good but they still have a somewhat sloppy look to them.