Igishushanyo cya kabiri cya firime isize firime ifite gloss nziza, gukomera, imbaraga nyinshi, hamwe nubuso bworoshye.Icya kabiri, ifite amazi meza yo kurwanya no gukora amazi adakoresha amazi, kubwibyo gukora rero ntabwo byoroshye guhinduka kandi bitameze neza, hamwe nigihe kirekire cyo gukora no kugurisha cyane.Nibicuruzwa nyamukuru bya Monster Wood, uruganda rukora amashanyarazi.Na none kandi, ifite imikorere ikomeye yo kurwanya ruswa, acide nkeya gusa na alkalis ikomeye irashobora kuyangiza, kandi muri rusange irashobora kunanira.
Ibara rya firime yahuye na pisine irasa, isukuye, yoroshye, kandi isura ni umukara (umutuku, umutuku cyangwa nkuko bisabwa), kandi ikirango gishobora gucapurwa ukurikije ibisabwa.