Quercetti Kaleido Gears – 55 Piece Building Set with 3 Different Sized Gears – Turn the Crank and Create a Chain Reaction! Ages 3 + (Made in Italy)

Amazon.com Price: $27.99 (as of 20/10/2019 06:31 PST- Details)

Even young children will delight in figuring out how to put the pieces together and attach the gears creatively and independently. Then become engrossed watching their creations spin!
Create your base, then insert axles and connect gears so that they rotate at the same time. Finally, turn the crank to start a spectacular chain reaction and watch the beautiful visual effects. 
The 6 largest gears have stickers that make captivating designs as they spin. The square base pieces interlock easily to form flat or 3D structures. You can even make a gear box!