These are tires they do exactly what they are supposed to do. I just got mine so can't say how long they will last but they cover my tires perfectly. And the clasp and buckle on the back is a bonus, allowing you to attach it firmly to the hoops. I'm one of those people who have a trailer but live close to where I sleep. That means my tires will rot in the sun before I've even worn the tread down. I hate that. These tires are a much cheaper alternative than buying new tires before you wear out the tread. My tires are 225 75R 15 so I had to find an online tire converter to get the right size. My tires are 28.3 inches. Some reviewers advise going up a size. I bought the right size and they fit perfectly. wear out faster than if they are stuck on the tire. I also chose these chocks for a special purpose. I have BAL X chocks on my trailer because my road is steep so I needed a chock that would work with them . Find (BAL 28012 X-Chock Tire Locking Chock) if you don't know what it is. They are inserted between the tires, which disturbs the tire. I mounted the tires by rotating them slightly to allow the bottom/edge to wrap around the cross pads. It probably won't work well without a strap, so this case is the one for me. My tires are still fully covered and protected from the sun and they are very safe. I like them so much that I immediately ordered another set for my work trailer. I took a picture of the box from the side showing all the E sizes they will work with. I will post this image on the product page for reference.