Copper Cylinder + Neodymium Magnets

Dropping neodymium magnets through copper cylinders and tubes. The magnets fall down very slowly. Why?

Because of Lenz's Law, the magnetic field of the magnet induces a current in the copper and that current generates a magnetic field that opposes to the first one.

https://en.wikipedia.org/wiki/Eddy_current
https://en.wikipedia.org/wiki/Lenz's_law
https://en.wikipedia.org/wiki/Neodymium_magnet
https://en.wikipedia.org/wiki/Electromagnetism

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