Ma ke aupuni o ka hana prototype, hana nui nā mea metala i ka hana ʻana i nā prototypes lōʻihi a pololei. ʻO nā metala e like me ke aluminika, ke kila, a me ka titanium e koho pinepine ʻia no ko lākou ikaika, kūpaʻa, a me ka hiki ke kū i ka hoʻāʻo paʻakikī.