1. Inani elikhulu lama-cores, sonke isakhiwo sokuvimbela amanzi omile, akukho mafutha okugcwalisa, ahlanzekile futhi ayashesha ngesikhathi sokwakhiwa, futhi akukho mthelela endaweni ezungezile.
2. High modulus glass fiber reinforced plastic rod (FRP) central reinforcement.
3. Ifilimu enezinhlangothi ezimbili esongwe ngobude embozwe insimbi kathayela yezivikelo zethayiphu ingathuthukisa ngempumelelo ukumelana nengcindezi esemaceleni yentambo yokubona.