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In page Flywheel:
"Flywheels are made from many different materials; the application determines the choice of material. Small flywheels made of lead are found in children's toys.[citation needed] Cast iron flywheels are used in old steam engines. Flywheels used in car engines are made of cast or nodular iron, steel or aluminum.[1] Flywheels made from high-strength steel or composites have been proposed for use in vehicle energy storage and braking systems.
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