These 2 AIR POWERED BALLOON RACERS CARS NEED NO BATTERIES and require only the air from the balloons to force the toy racing cars move forward. Besides the fun, you can teach your kids Aerodynamics science and engineering with these toy racer cars, and let them learn and educate themselves on the principles of physics, science and engineering. Also a great gift for any occasion. Balloon powered car race toys gift kit set makes the best and perfect gift for birthdays, parties, as a party favor or stocking stuffer for any young child. The balloon car kit toy racing car set is packed in an attractive full color gift box with INSTRUCTIONS INCLUDED. The vehicle set includes 2 cars each about 4 inches long x 2 inches wide and 1.25 inches high, along with 12 balloons. All the racing fun and excitement you need packed in a travel size gift box. Ages 6+ please.