Amabati ya Galvanised muri Coil (GI) yakozwe mugutambutsa urupapuro rwuzuye rwakoresheje uburyo bwo koza aside hamwe no kuzunguruka binyuze mu nkono ya zinc, bityo ugashyira firime ya zinc hejuru.
Ifite ruswa irwanya ruswa, irangi, kandi ikora bitewe na Zinc iranga.Mubisanzwe bishyushye byashizwemo urupapuro rwicyuma hamwe nicyuma cya coil hamwe nibisobanuro birasa.