Aluminium-conductor steel-reinforced cable ACSR is galvanized steel, but zinc, 5% or 10% aluminium alloy and trace mischmetal coated steel (sometimes called by the trade-names Bezinal or Galfan) and aluminium-clad steel (sometimes called by the trade-name Alumoweld) are also available. Higher strength steel may also be used. In the United States the most commonly used steel is designated GA2 for galvanized steel (G) with class A zinc coating thickness (A) and regular strength (2). Class C zinc coatings are thicker than class A and provide increased corrosion protection at the expense of reduced tensile strength. A regular strength galvanized steel core with Class C
I Don't Know What It Is Marius de Vries admitted that "I Don't Know What It Is" was one of the most complex production challenges he had ever faced, with its hundreds of layers of separate orchestral, choral, and vocal parts. Between "running around" and "chugging along" "on a train going God knows where to" in a sort of aimless wander, transportation is a major theme of the song. Wainwright alludes to several locations, from precise ones such as Calais, Dover, Poland and Lower Manhattan to more abstract locales like Heaven, Hell, and Limbo. Wainwright said the following of the song: References are also made to