Ezi bhokisi zesipho eziphezulu zibonisa uyilo olusongwayo olulodwa olunophawu olufihliweyo lwemagnethi yokuvalwa okukhuselekileyo.Ukugqiba okukhazimlayo kukulungele nasiphi na isiganeko.Ezi bhokisi zesipho ziyisisombululo esifanelekileyo kubathengisi abanendawo encinci yokugcina ngenxa yokuba balala kwaye banokuhlanganiswa ngemizuzwana.Ezi bhokisi zikhethekileyo zokusonga i-clamshell kulula ukuzihlanganisa kunebhokisi ezisongwayo zemveli kwaye zenziwe ngeepaneli ezishinyeneyo ezinomphetho owomelele ngakumbi, njengebhokisi eqinileyo.Njengebhonasi, iibhokisi zinokudityaniswa kwaye zihlanjululwe ngokuphindaphindiweyo, ngoko zingaphinda zisetyenziswe ngamaxesha amaninzi.