Ibi bimenyetso bifite imiterere nicyiza cyicyuma, ariko ibikoresho bakoresha bifite imiterere itandukanye nicyuma. Ibikoresho bakoresha nibyo twita "ibyuma byamazi". Ugereranije nicyuma nyacyo, plastike yacyo nibyiza, kandi biroroshye kubyara ingaruka nuburyo butandukanye bisabwa mubirango.