ʻO kahi kānana pūʻulu wili i loko o ka media metala he ʻano kānana i hoʻohana ʻia i nā ʻoihana like ʻole, ʻoi loa i nā kaʻina hana polymer.Hiki ke hoʻonā ʻia ka aila, ke kinoea, ka wai, ka momona, ka wai, ka polymer a i ʻole ke ʻano o ka hopena kahe i kēlā me kēia mahana.Loaʻa ia i kahi uea metala a i ʻole pale i wili ʻia i kekahi ʻano, e like me ka cylindrical, rectangular, square, oval a i ʻole nā mea ʻē aʻe.Hoʻokomo ʻia kēia kānana pack i loko o ka ʻōnaehana kānana e wehe i nā haumia a me nā ʻāpana mai ka hopena.Hāʻawi ka media metala i ka ikaika kiʻekiʻe a me ka lōʻihi, e ʻae i ka kānana e kū i nā wela kiʻekiʻe a me nā kaomi.