It's a tire designed to resist deflating after it is punctured (IE Nail, road debris, Glass) for up to 100 miles therefore eliminating the need to carry a spare. It is stock on the 370z as well as many BMW's. I really hate these tires sitting in my garage. I am cutting my losses. 500 and shipping, they are yours. I'm ready to move on. I just want $$$ to do what i love,
