The Amphibian Rover Kit by Toysmith lets you build a motorized "green" car that runs on land or water. Four plastic bottles act as both wheels and floats, with two paddle wheels providing propulsion. This is a fantastic science project that lets you recycle and be brainy at the same time. Comes with clearly illustrated assembly instructions. Every science class should be this much fun! Kit includes plastic body parts motor, battery case, wheel hubs, paddles, screws, terminal caps and instructions. Green Science approved because this science kit supports recycling by using four of the millions of plastic drink bottles thrown out every day. Requires 2 AAA batteries, not included.