The set includes 6 balls of 25mm diameter each of different materials-one each of wood, aluminum, steel, copper, brass & lead. Surface rust has formed on the steel ball.
Ideal for collision experiments and pendulum demonstrations and can also be used to meet a variety of laboratory needs.
Solid spheres are also suitable for density/volume experiments.

PLEASE NOTE: Due to the nature of iron, rust has developed on the surface of the iron/steel ball. This will not affect the experiment. Fine sandpaper can be used to remove the rust.