Harbottle, teaching tool for introducing pressure and discussing its applications, such as vacuum cleaners, flight, pumps, weather, and even how we breathe, balloon and a bottle, Measures 5In in diameter. Grades 5 and up
II Launch Pad, Porta-Pad*, with blast deflector and standoff, two-piece 1/8 inch launch rod, safety cap and key, no glue/tools required, Quick assembly,