Hōʻike Pōkole:

Nā hiʻohiʻona huahana: ʻenehana ʻenehana hou, hoʻokalakiko pono iā ʻoe iho, wili ʻoi, kūpaʻa wela kiʻekiʻe, paʻakikī paʻakikī, kiʻekiʻe maikaʻi a ʻaʻole maʻalahi e komo, diamona like a me ke one, hana maikaʻi, palekana a me ka pale ʻana i ke kaiapuni, ʻokiʻoki me ka ʻoki ʻole a me nā mea maikaʻi ʻē aʻe .

Kūpono nui nā huahana no: nā ʻano metala a me nā pono ʻole metala, wili kila kila, wili mea ʻoki, alloys, daimana, aniani, pālolo, nā mea semiconductor (silicon carbide, a pēlā aku) ferrites, a pēlā aku) a me nā mea hiki ke hoʻoheheʻe ʻia (paʻa paʻa, kila tungsten YG8, a pēlā aku.)