ʻO ka pahu kahi pahu pahu ukana maʻamau i hoʻohana ʻia no ka lawe ʻana i nā ukana. Hana ʻia ia me ka metala, ke kila a i ʻole ka aluminika a he ʻano maʻamau ka nui a me ke ʻano e hoʻomaʻamaʻa i ka hoʻololi ʻana ma waena o nā ʻano kaʻa like ʻole, e like me nā moku ukana, nā kaʻaahi a me nā kaʻa. ʻO ka nui maʻamau o kahi pahu he 20 kapuaʻi a me 40 kapuaʻi ka lōʻihi a me 8 kapuaʻi me 6 kapuaʻi ke kiʻekiʻe.