Concave Glass Mirror, 50mm Diameter, 150mm Focal Length Pack Size_Single providing dense uniform spheres for

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

3g nickel-plated steel balls on a red wood base

used to demonstrate capacitance and the discharge of stored static charge

Triple tandem plastic pulley with 25/38/50mm ball-bearing wheels on an open-sided 17

Four-cylinder equal-mass set at 100g each in copper

Concave Glass Mirror, 50mm Diameter, 150mm Focal Length Pack Size_Single providing dense uniform spheres forConcave glass mirror, 50mm diameter and 150mm focal length, the f 3 curvature stretching the focal throw for demos that need the focal point set comfortably beyond the mirror face.