I bought a 5" ball for my little 1 year old midget robots. The small air grooves seemed to prevent them from running quickly across my floors. They didn't seem strong enough or heavy enough to push the ball. So I have this track and what is the difference. You run so fast. The ball is a bit small for the rail but still works well as it allows for easy repositioning. My four year old son loves it too. You can have fun with them in a safe game. One note: I didn't like the aka Kaytee Cruiser car. I returned it. Very cheap and too big for my imp robots. The car drove very clumsily when I also tried to push it around the track. Just stay on the ball.
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