I've been plugging tires since I was young. Such corks used to be sold everywhere, but everyone switched to weak corks, which are very similar to rope, corks that do not hold air well. This type is exactly the same as the ones I used a long time ago. It's more like thick, sticky rubber than a rough rope covered in goo. So far I have clogged two tires on my lawn mower because the old man who used to own my land left strange things all over the yard for my mower to find. and hit. No leakage even without using glue. I would also connect car tires to it without hesitation.