Build the ultimate revved up racecar and put it to the test, with VEX Robotics Gear Racer. This easy snap-together kit will have you racing speedy robot-inspired cars in no time! Through assembling this kit, kids see firsthand how machines convert potential energy into kinetic energy, while the multiple gear ratios demonstrate fundamental principles behind speed and torque. VEX Robotics Gear Racer includes multiple gear sets, rubber bands, wheels and all of the pieces needed to design one complete racer! VEX Robotics Gear Racer is compliant with CPSIA standards. Batteries not required. Age recommendation 8 and up.