An elastic material of compact (solid) or cellular structure having smooth, crepe or porous surface(s) and having an oval, parallelogram, square, rectangular or d-shaped cross section. It is produced in various thicknesses. Strips are limited to widths of 6 inches (152.4mm) or less. It may or may not have a nonrubber backing or a wire cloth or cord insert. For items having a round cross section, see rubber round section. Excludes rubber sheet, inner tube repair. See also nonmetallic angle; nonmetallic channel; nonmetallic special shaped section.