Take to the skies with new STEM skills! Using sturdy plastic gears that twist, turn, and move, little engineers can follow the building suggestions in the included activity guide or design their own sky-ready flying contraptions. Each vehicle can incorporate accessories inspired by real flying machines, such as a propeller or wheels. Works with all of our best-selling Gears! sets. Size: 23.1 x 23.6 x 7.4 cm. Ages 6+.