Ngesibindi esiyingqayizivele, lezi zibuko zelanga zinikeza iphrofayela efana nenye.Lesi sakhiwo esiphefumulelwe ngendlela esingajwayelekile, esinombala ohlukile webhlokhi i-acetate eqhathaniswa nebhuloho lekhala eliyi-doublemetal ngegolide elicwebezelayo.I-acetate yombala ohlanzekile ogcwele rimu, isikwe esincane sekhona lebhuloho kanye nemininingwane yensimbi kwenza le modeli ihluke kwezinye.Lokhu kubukeka kwezizwe zonke kuyimfashini futhi kudonsa amehlo.