Materials Chapter 3 Introduction The correct identification and use of the various materials in  parachute manufacturing and repair are of vital importance to  all riggers. Just as important as acquiring knowledge of tools  and machines, knowing and using the correct terminology  for materials is essential to the rigger’s job comprehension.  In doing repairs or alterations, the rigger must be able to  identify the types of materials used in order to duplicate the  original manufacture and to ensure the correct level of safety  necessary. Some materials may look similar, but there can be  subtle differences between them that make a major difference  in their strength or durability.