Ob hom tshuaj mould yog ob hom khoom siv yas txhaj tshuaj molding rau tib lub cav txhaj molding, muab faib ua ob lub vias, tab sis cov khoom tsuas yog pwm ib zaug. Feem ntau, cov txheej txheem molding no kuj hu ua ob chav tshuaj molding, uas feem ntau yog ua tiav los ntawm ib pawg moulds thiab yuav tsum tau siv ob npaug tshwj xeeb ob kob tshuaj molding tshuab.
Dual colour pwm yog nce nrov nyob rau hauv kev ua lag luam, uas yuav ua rau cov tsos ntawm cov khoom zoo nkauj dua, yooj yim los hloov xim thiab tsis tuaj yeem txau, tab sis tus nqi kim kim thiab qhov kev xav tau siab.