There is nothing special about these extension cords at all. To put it bluntly, you crap metal, the o-rings are way too thick, it's almost impossible to use them properly without trying to screw them in so tight you'll probably screw in your TPMS sensor. Finally the ball doesn't fit very well so they leak a little if you don't seal them airtight and to be honest they're a bit nasty but I guess to each their own. All of this to say they aren't terrible and the issues they have are pretty easy to fix but I definitely wouldn't pay more to buy them again if you know what I'm talking about. I hope this helps if you decide to buy them