Solid Steel Ball, 1-1/2In, Pair (Smashing Steel Sphere Kinetic Energy Demo), For physics experiments and demonstrations such as kinetic, density and volume measurements, pendulum bob, potential energy and conservation experiments, ballistics etc.
Specific Gravity Metal Cylinder Set Copper, Zinc, Aluminium And Steel, Four Different Metal Cylinders Each Measuring 38 mm Long X 10 mm In Diameter, Made Of Aluminium, Zinc, Copper And Steel.