"physics kits"

Density Cubes, Set of 4 Metals with Hooks, 1.26" (32 mm) sides, lead free.

4 Holders, 12 Al Rods, 12 Brass Rods, 12 PVC Rods, 12 Polypropylene Rods

Excellent teaching tool for introducing pressure and discussing its applications such as vacuum cleaners, flight, pumps, weather, and even how we breathe.

With the magnet is on the outside, it's easy to see the science behind these eddy tubes.