ʻO nā kaula fender he mau kaula i wili ʻia a i nakinaki ʻia paha i mea e hana ai i kahi bumper mānoanoa a pale. Hoʻopili ʻia ia i waho o ka waʻa a i ʻole ka hoʻopaʻa ʻana e pale aku i ka pōʻino mai nā hopena, a pale i nā waʻa a me nā hoʻopaʻa ʻana mai nā kuʻi pono ʻole.