Double Cone Uphill Roller - $20 (Cliffside Park)

condition: new

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Uphiller roller. The double cone rolls uphill instead of downhill. The shape of the cone changes the center of gravity to make this possible. It can be used as a toy for a child or as a science lesson for older students.

post id: 7961023428

posted: 2026-09-04 21:02

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Double Cone Uphill Roller - toys & games - by owner - sale -...

Uphiller roller. The double cone rolls uphill instead of downhill. The shape of the cone changes the center of gravity to make this possible. It can be used as a toy for a child or as a science...