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Belts used in engines are typically made of rubber due to its excellent flexibility, durability, and resistance to wear and heat. Rubber provides the necessary grip to transmit power effectively between engine components, such as the alternator, water pump, and power steering pump. This material also allows for the required stretch and flexibility, enabling the belt to adapt to various engine operations without breaking or slipping.

In addition to rubber, many engine belts may also contain reinforcing materials, such as fabric or fibers, to enhance strength and performance. However, the primary material remains rubber because of its ability to withstand the harsh conditions found in the engine environment, including exposure to oil and high temperatures.

Other options like metal or plastic do not provide the necessary qualities for effective belt operation in an engine setting. Metal belts would be too rigid and could create significant wear and noise during operation, while plastic does not have the tensile strength or flexibility needed for the constant motion and stress within a running engine. Fiberglass, while strong, is not used for belts either, as it lacks the necessary flexibility and would not perform well under the dynamic conditions present in an engine.