To provide a vulcanized rubber that absorbs energy, such as vibrational or sound wave energy, by a material in contact with the source of that energy and damps energy.

The vulcanized rubber includes a rubber, and a damping material that is produced by preparing a mixture of living polymers that include living polymers with at least two living ends and living polymers with one living end to form a mixture of living polymers, and coupling the mixture of living polymers with a coupling agent that has at least three reactive functionalities.