ʻO nā mea hoʻoheheʻe hao hina hina, ʻo ia nā huahana hoʻoheheʻe i ninini ʻia e ke kaʻina hoʻoheheʻe wax i nalowale ma ka hale hoʻoheheʻe metala. ʻO ka hao hina (a i ʻole ka hao hina hina) he ʻano o ka hao-carbon alloy (a i ʻole Ferrum-Carbon Alloy) nona kahi microstructure graphite. Kapa ʻia ʻo ia ma muli o ke kala hina o ka haʻihaʻi i hana ʻia. 
