About this item:
This jumbo-size building set is big fun for little hands! Children simply stick the gears onto a large magnetic surface…slide the interchangeable pieces together any way they like…then turn a built-in handle to start the spinning show—exploring cause & effect and more!
The set includes: 10 plastic gears in 5 colors and 2 sizes, plus a guide.
Large gears measure 11 1/4". 
Magnetic board is sold separately.