Fit perfectly on Rustler 4x4 but they are a little big then the stock ones.
The rubber is soft, durable and molded with good detail. It has a good amount of foam evenly distributed inside. I suspect that it has to be glued for driving with high powered cars if you want to avoid the rims sliding in the tire. The rims looks like they are done with a good mold but the plastic does not seem very flexible and I would not be surprised if it would end up cracking rather than flexing. That said, the price more than makes up for the plastic potentialy being of a sub-optimal kind. I just recieved to items so actual durability after use is yet to be determined.