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Formers are a type of airframe structural component that is used in the construction of aerospace craft. They are typically made from materials such as aluminum or composite materials and are designed to provide shape and support to the structure of the aircraft. Formers are often used in areas where the aircraft's skin needs to be curved or shaped, such as the fuselage or wings. They are typically pre-formed or molded to the desired shape and then attached to the aircraft's structure using fasteners or adhesive. Formers play a critical role in maintaining the structural integrity and aerodynamic performance of the aircraft.