Good bumpers at a good price. The reason I gave them four stars instead of five is because I got two tires with different durometers so the batches could be more even. They were quite stiff which should help with durability and is great for a heavy ramp door. It is noteworthy that out of the four pairs I received, two were of varying firmness. I would compare the firmness to the hard sole, motor, gears, or body support of a hiking boot, and it's a little firmer than most rubber tires. I bought them for a purpose other than trailer ramps as I needed rubber anti-vibration feet for my car's compressor. but couldn't find it anywhere. My vibration isolator legs were crumbled and seemed too small for the weight of the gear. Of the four I ever received in a separate package, two were of different hardness. In other words, two of them are softer than the other two, but overall they're a lot stiffer than I was hoping for. I figured they would probably be fine, but I believe in their thoroughness and wanted to make them more suitable for my use, so I drilled two rows of 3/16" holes around the perimeter to make them more flexible, and I think they will work fine now.