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 dif