About this item:
This incredible building set lets kids put together their own spectacular, spinning show! The interchangeable pieces slide together easily for a no-fail design. Children simply stick the gears onto a magnetic surface…fit them together any way they like…then turn one of the built-in handles to set the whole colorful creation in motion!
 
The sturdy plastic set consists of 22 magnetic gears in 2 sizes.
 
Large gears measure 3 3/4". 
Magnetic board is sold separately.