I got them for a very light application. I read all the reviews and realized they are not made for heavy truck wheel pads or extreme situations. I only needed them for a light kart to keep it from rolling down the slope. For that purpose they are great. They are hollow and therefore easy to stack. And be prepared that they are very light and have no inherent bottom grip or stickiness other than the bumps of the hollow bottoms. If all you need is a light wedge, this will do. I read some reviews that people use them on cars. I would hate to try them for this application
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