Our Large Gear Construction set measures 36cm x 45cm x 2cm. Each set comes with an interchangeable gear board and 10 gears ranging from 15cm to 8cm. Our Gear Construction Set is an excellent way to introduce STEM concepts with your children. Helping to promote problem-solving, critical thinking, and perseverance. Depending on the number of gears linked together will then determine the strength needed to move them.