ʻO ka ʻāpana hoʻopaʻa paʻa a me ka metala he mea hoʻopaʻa paʻa e hui pū ai i ka plastic a me nā mea metala.Loaʻa ka nui o nā hui kuʻi pahu pahu i hana ʻia me nā mea POM a me nā mea OEM maʻamau i hana ʻia me ka mea ABS.ʻO kēia sila hui pū kekahi mau mea maikaʻi, e komo pū me ke kūpaʻa corrosion kiʻekiʻe, ke kaumaha māmā, a me ke ola lawelawe lōʻihi.