Drilled Ball Set for physical science and physics is a convenient set of drilled balls for all your pendulum experiments. Set includes a variety of twelve balls.
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A convenient set of drilled balls for all your pendulum experiments. Each ball is 25 mm in diameter and has a 3-mm hole drilled exactly through the center. The set of twelve includes two each of brass, aluminum, steel, cork, wood and copper. The ball set comes in its own clear plastic storage box.