Yenziwe ngePVC ekumgangatho ophezulu, ezi glavu zibonelela ngokhuseleko olugqwesileyo kwimichiza, izicoci ezirhabaxa, namanzi ashushu, nto leyo ezenza zibe lolona khetho lufanelekileyo lokuhlamba izitya, ukucoca amagumbi okuhlambela kunye nokuhlamba iimpahla. umaleko ojikeleze ingaphakathi, obonelela ngokufudumala kunye nokuthuthuzela ngexesha leenyanga ezibandayo.Lo maleko awugcini nje ngokugcina izandla zakho zipholile, kodwa ukwafunxa ukubila kunye nokufuma, ukuthintela izandla zakho ekubeni zizive zipholile kwaye zingakhululeki.