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Got these as a teaching demo for physics class—the way the momentum transfers between the polished steel balls makes the concept click instantly. The base is solid enough that it doesn't slide around on the desk, even during bigger swings.

Each ball swings with a satisfyingly precise click that really demonstrates the relationship between mass and force. Set it up on my desk and it's been a fun way to visualize physics concepts while I work.

It works exactly as described—the way each pendulum conserves momentum is oddly mesmerizing to watch. The metal balls have a satisfying, solid clack that really drives home the physics lesson. A great desk toy that makes a complex concept feel tangible.