Zinc-galvanized springs inoiswa pasi pekupisa-dip galvanization process.Kuita uku kunosanganisira kunyudza chitubu chesimbi mumudziyo wezingi yakanyunguduka pakupisa kwakanyanya.Vanhu vazhinji vanosarudza zvitubu zvezinc-galvanized torsion nekuda kwekudzivirira kwavo kunoshamisa kune ngura nekuora uye vanopa hupenyu hurefu kupfuura zvitubu zvakawanda zvine mafuta.