Isici somkhiqizo :
1. Inani elikhulu lama-cores, zonke izakhiwo zokuvimbela amanzi omile, akukho mafutha okugcoba, ahlanzekile futhi ayashesha ngesikhathi sokwakhiwa, futhi akukho nomthelela endaweni ezungezile.
2. High modulus glass fiber reinforced plastic rod (FRP) central reinforcement;
3. Ifilimu enezinhlangothi ezimbili esongwe ngobude embozwe insimbi kathayela yezivikelo ingathuthukisa ngempumelelo ukumelana nokucindezela kwentambo yentambo yokubona.