Non-slip wheels made of strong plastic for tracks with 3.5" pitch. The pull pin is higher and wider than standard wheels, so you can keep the track looser without overjumping. In this case, the track also rolls more easily. The material of the standard drive wheels is soft and the drive pins wear easily when overshooting, making the problem of overjumping even worse. Standard drive wheels can also start to spin on the drive shaft itself as a result of a hard impact or stress. When you encounter problems with standard traction wheels or you drive your sled violently, with Blingfactory's No-slip wheels you ensure that your journey is not interrupted and your sled works better!