Browse the collection of Golden Openable Round Cage Metal Pendulum at low prices. A pendulum is any weighted object on a string or chain. Pendulums can be made of beautiful crystals, metal or wood, or can be a paper clip on a string. A necklace such as a pendant on a chain can also be used. Pendulums are best used indoors where there is no wind to affect the movement. They can be used to ask questions, define answers on a chart, show the energy of a chakra or test for imbalances in a persons energy fields.