Lezi zikhwama zikadoti ezihlala isikhathi eside zenziwe nge-polyethylene ephezulu yekhwalithi ephezulu enekhwalithi engaguquki ezenza zithembeke ngokwedlulele.Izikhwama zemfucumfucu ezisindayo zinikeza inhlanganisela enhle kakhulu yamandla efilimu, ukumelana nokubhoboza kanye nokumelana nokukhala.