What is the Magnetic Toy that spins back and forth?

I've had this toy back when I was young in the 70's and just recently saw it on a movie called Mr. Magorium's Wonder Emporium. It's handheld and you basically move it in a way the magnet rolls and goes around and under and as long as you keep moving it, it will keep on going. What is it?What is the Magnetic Toy that spins back and forth?whee-loWhat is the Magnetic Toy that spins back and forth?Oh that thing. There is also one giant one on the movie, Robots. Its called a whee-lo i think.

Hope I helped!

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