Learning Resources Gears! Gears! Gears! Super Building Set, 150 pieces
Learning Resources Gears! Gears! Gears! Super Building Set, 150 pieces — about $35 · 4.8 stars.
Chunky gears that snap onto a base and mesh with each other. The blind-buyer angle: pieces seat by feel, and turning one handle moves the whole machine — cause and effect you can trace with your fingers from the crank to the far gear.
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