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Nā wili kila Annealed ʻeleʻele
ʻO Cold Rolled Black Annealed Coils (CRBA) i kapa ʻia ʻo "Blue Steel".ʻO CRBA kahiwili kila ʻōwili anuanui hoʻoheheʻe ʻia e ka annealing i kahi hoʻonohonoho kūikawā i mea e hana ai i kahi papa magnetite lahilahi loa (Fe304) ma luna o ka ʻili (emi ma lalo o 1 μm mānoanoa) no ka pale hou aku.