Project Mc2 CO2 Rocket Science Kit Make your own CO2-powered "Message in a Bottle" rocket with Project Mc2 construction queen, Camryn Coyle Blast a secret message sky high using safe household ingredients, like baking soda and vinegar Includes all pieces need to build the rocket, including rocket top, body with secret message compartment, chamber, base and fins Decorate the rocket with the 2 sticker sheets and 2 rocket-shaped chalk markers