DK Readers L1: I Want to Be a Ballerina Unique and totally cool science project. Watch your catamaran skim across the water on its pop-bottle floats. Pushed by its spinning propeller. Add two 1 liter bottles to the contents of this kit and make a 10" X 9.25" catamaran. Watch your catamaran skim across the water on it's pop bottle floats. Add two 1 liter bottles to the contents of this kit and make a 10"X9.25" catamaran Launch it in the pool and watch it go Watch your catamaran skim across the water on it's pop bottle floats Help save the earth by re-using two plastic bottles as floats for this model catamaran Create a "Green Science" project, requires 2 AA batteries-NOT INCLUDED