4-Metal Density Cubes Set with Hooks, 32mm (Brass, Lead, Aluminum, Steel) Electricity & Magnetism_Electricity & Circuits Molded in one piece with

Molded in one piece with sleeve-bearing wheels

providing dense uniform spheres for ramp-and-collision experiments where a heavier projectile is needed than the plastic marbles can provide

this decade resistance box substitutes for fixed resistors in circuit experiments

Sixty-five-piece molecular model set with 32 atoms and 33 bonds for demonstrating bonding angles

4-Metal Density Cubes Set with Hooks, 32mm (Brass, Lead, Aluminum, Steel) Electricity & Magnetism_Electricity & Circuits Molded in one piece withFour metal 32mm density cube set with hooks in brass, lead, aluminum, and steel in a snap top case, with masses between 50 and 400g for 5N spring scale suspension work.