Yenziwe ngensimbi ye-carbon ephezulu, isibambo sehhuku side, ithiphu yehhuku ibukhali, ukumelana nokugqwala kunamandla, futhi izinga lokudla izinhlanzi liphezulu.Isibambo se-hook siklanywe ngokuvumelana nesimiso somshini ukuvikela ukungqubuzana phakathi komugqa nendawo ye-hook, okunciphisa kakhulu amathuba okuphuka kwentambo futhi kube nokuzinza okuqinile.Ithiphu yehuku ngalinye elibukhali lipholishwa izikhathi eziningana ukuze kuqinisekiswe ukucija kwehhuku, elingafinyelela umphumela wejubane lokungena ngokushesha kanye nobude bokungena obujulile.Endabeni yokungakhulisi umugqa we-hook kanye nesisindo somzimba we-hook, ukungezwani kwe-longitudinal ye-hook kwenziwa kakhulu.