ʻO ke kila kalapona, ʻo ia hoʻi ke kapa kila-carbon steel, he ʻano metala i hana ʻia ma o ka hui ʻana i nā nui kalapona a me ka hao.Aia kekahi mau mea ʻē aʻe akā ma nā mea liʻiliʻi loa e hoʻopilikia i kona mau waiwai kino.ʻO ka uwea kila kalapona me ka haʻahaʻa carbon maʻiʻo ua like nā waiwai me ka hao i palupalu a maʻalahi hoʻi.