Defines the default material name for all individual shell courses.
Click the ellipsis 
to the right of the box to display the Database option or View Properties option.
Click Database to display the Material Selection Dialog Box. From the dialog box, you can select any valid material from the active database. Click Tools > Configuration > Database Definitions Tab (Configuration Dialog Box) to select or change the active material database file.
Click View Properties to display the Material Properties Dialog Box. The material data specified on the dialog box pertains to the entire tank. If the material varies over the shell courses, you must specify the change on the Shell Courses Tab (General Tank Data).