They can be made of anything that will sway easily on a string. Rings, gemstones, copper spirals, silver or even a coin can be attached to a cord and swing holding the cord with one hand. The material you use to attach the the object to should be light enough to easily move with out being weight down too much. Commonly used materials are chain, thread, cord or thin rope.
Pendulums can be used in a number of ways for a variety of reasons. Most commonly pendulums are asked a question and will sway clock wise or counter clock wise, or they will sway back and forth or to and fro Depending on how it prefers to answer. You first want to ask your pendulum to show you a yes answer and let it move naturally. When it is clearly moving in a particular way. Thank it and stop its motion. Then ask for a no answer and it will likely begin moving in the opposite direction. You can then begin asking questions that require an yes or no answer.
You can also use your pendulum in others ways.
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