Make your Cartesian Diver rise and sink</br>Teaches science principles</br>Fun hands-on science experiment</br>Plastic soda bottle not included</br>For ages 5 and up</br></br>Product Description</br></br>Explore the principles of density?? pressure and fluid dynamics with the 4M Cartesian Diver Science Kit. Watch how you can make your Cartesian Diver rise and sink inside a water bottle. Compete with your family and friends to see who can control the diver best! A great hands-on science experiment for kids. Plastic bottle not included. For ages 5 and up.</br><br/>http://www.amazon.com/gp/product/B004QVIEDE