I love the size, strength and aggressive look of these wheels. The only downside is that they are quite heavy and I would like the tire to be either pneumatic or a lighter hard rubber. They are made of a very dense mixture of plastic and rubber. They would be good for heavy applications. I used them to replace the stock plastic wheel on my utility cart. They work great but now I'm having a much harder time packing them in my van. My shopping cart has doubled.