Hand-cranked Trackball Model
Hand-crank drive gears to start a steel ball adventure, the double rails go together, and the steel balls converge and collide. And starry sky pattern carving out a dreamy atmosphere.
The wavy track makes the ball slide up and down.
Star-shaped unique storage ball storage card slot.
The retro wooden hand crank turns smoothly.
Mechanical transmission system with various gear configurations.
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