E = Extrusion + XXXX = Material | AAA = Dimension A | BBB = Dimension B | EXSR = Solid Rectangle
The first segment begins with E to indicate that the product is an extrusion. The XXXX represents the extruded EMI Material.
The second segment (AAA) is Dimension A.
The third segment (BBB) is Dimension B.
The fourth segment (EXSR) indicates that the shape is Solid Rectangle.