Use Classic KNEX pieces to build the Transport Chopper with motor; Build the Transport Chopper with 341 pieces and turn on its motor to watch its chopper blades take off; Or build the alternate helicopter or fixed wing airplane, both with working propellers; Build the transport chopper and turn on the motor to watch its chopper blades rotate; With working winch and opening cargo bay door the transport chopper will provide hours of entertainment. Includes over 340 knex pieces to create 3 different models including an alternate helicopter and fixed wing plane, both with working propellers; Colourful step-by-step instructions. Combine with the 4 wheel drive truck, sold separately, to create an awesome combo build car with moving pistons, axle and lights. Size H24.77, W6.35, D30.48cm. Batteries required: 2 x AA (not included) plus (included). For ages 7 years and over. WARNING(S): Not suitable for children under 3 years old. Only for domestic use. To be used under the direct supervision of an adult.