Valang yopanda kanthu kazithunzi kamene kamasinthira mawonekedwe a cheke (valavu yopanda tanthauzo) yokhala ndi kulumikizana kochepa. Amagwiritsidwa ntchito kuloleza madzi kudutsamo mbali imodzi yokha, ndipo disc imalumphira pampando kuti ilolere yoyenda, kapena kuyimikira pampando kuti mutseke kusintha.