It's no stretch to imagine the excitement of five racing machines, powered by the stored energy in everyday rubber bands. Ultralight plastic and bamboo parts, from wheels to propellers to axles, are used to construct a helicopter, fan boat, airplane, car and catamaran. Kids will discover that physics can be cool, learning about energy as they strive to win every race. Contains chemicals- Adult supervision suggested. From Thames & Kosmos, for ages 8 yrs-teen.