D'Addario is a manufacturer of strings and accessories for musical instruments, primarily for guitars, basses and orchestra musical instruments.

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The company currently has its world headquarters in Farmingdale, Long Island, New York, and its European headquarters in Newcastle upon Tyne, England. It is a family-owned and operated business and one of the largest string manufacturers in the world, not only producing several lines of strings under their own brand names, but also making strings for other musical instrument companies.